The Small Business Server Replacement is Clear(OS)

Microsoft still has a stranglehold on the desktop and servers for small business. While wheels are in motion for the former, the answer to the latter may already be here.

When it comes to the Internet, Linux is a big win.

Mail and web servers, databases, computational clusters and supercomputers all belong to the domain of free software. When it comes to embedded devices, Linux is also king of the roost.

There are two main areas where Linux has still not broken through, however – the desktop and servers for small business. Many small to medium enterprises are already “Microsoft shops” because the desktops run Windows. To break in, Linux needs to slot into these environments without causing a fuss.

Certainly the cloud is offering one solution to this problem, but not all companies are willing to put their sensitive data on-line and in the hands of another. So, a market for local servers to perform these functions is still alive and well.

The requirements

Part of the reason that Microsoft Small Business Server (SBS) is attractive is that it includes many core features required by a company, out of the box. Important services like central authentication, email, file and print sharing and web. Perhaps most important of all is calendaring. It’s something which businesses simply cannot survive without and has been a thorn in the side of Linux based alternatives for a long time.

Here’s a quick glance at some of the main features included with SBS:

    Centralized Authentication (Active Directory)
    Mail, calendaring and instant messaging (Exchange)
    Webserver (IIS)
    Firewall (ISA)
    Content management system (Sharepoint)
    Antivirus (Forefront)
    Database (MS-SQL Premium version only)
    Remote Desktop Services
    Virtual Private Network (VPN)

Putting company culture and licensing issues aside, if Linux is to compete with SBS it needs to at least perform these specific functions. Not only that, but any Linux operating system needs to be a drop in replacement. It needs to work seamlessly and be simple to use.

It’s one thing to replace a back-end server with Linux, but the desktops aren’t going to go quite so easily. The Linux server therefore must also act as a Primary Domain Controller (PDC) for the Windows based network. This will enable Windows machines to join the network and make use of features such as roaming profiles.

Secondly, if it looks and works differently, users will complain. Most of these companies will be using Microsoft Outlook as the front end to mail and calendaring. Ideally, any Linux server should also work with Outlook.

The answer becomes clear

Why hasn’t Linux broken into this market, like it has with other larger server infrastructure? It’s not because the tools to handle these functions do not exist. On the contrary, in each of these individual areas Linux excels. That’s right. Linux can act as a Windows PDC, share files, serve printers, let alone webservers and databases!

Previously the biggest chink in the armor was decent support for calendar and contact sharing. These days however, there are dozens of options in the form of various groupware implementations. Yes, this too is no longer a hindrance, which is good because it’s a major reason why SBS is still used so heavily.

So all the required various tools exist and any experienced Linux user should have no trouble building a powerful SBS replacement. That’s good and well, but when sysadmins are not Linux savvy they require an operating system that installs these features out of the box, with an easy to use interface. If Linux is too hard to use, they will continue to use Windows. Not only does there need to be a major incentive to switch from Windows to Linux, there need to be as few stumbling blocks along the way as possible.

Now, meet ClearOS, a free and open source Linux distribution which does just that. ClearFoundation released the stable version of ClearOS 5.1 just before Christmas and it is available for download.

It might sound like a new kid on the block, but actually ClearOS has a long history going back to the turn of the century. It was previously known as ClarkConnect, a very popular distribution for setting up a Linux server quickly and conveniently. ClearOS is now built on CentOS, which is in turn built from the source code of Red Hat Enterprise Linux. As such, ClearOS has a solid and reliable foundation.

Features galore

ClearOS pulls all those required features together in a small, simple to install and use package. It can turn any machine into a sophisticated, reliable and powerful server for any network.

So what does it offer? Here’s just a taste:

    Centralized Authentication (LDAP)
    Primary Domain Controller (Samba)
    File and Print Services (Samba and CUPS)
    Mail (SMTP, POP, IMAP, Webmail)
    Calendaring (Kolab groupware)
    Webserver (Apache)
    Firewall plus intrusion protection (iptables, Snort)
    Antimalware (Clam Antivirus, Antiphishing, Antispyware)
    Antispam (Spamassassin)
    Database (MySQL)
    Virtual Private Network (IPSec, OpenVPN, PPTP)
    Web Proxy (Squid)

The complexity of these individual components is hidden behind the web based management interface, where users can simply turn on and off these modules as required.

While users are encouraged to administer the system via the provided management interface, it is also designed to be extensible. The back end is not hidden away, but offered up in plain sight for admins to get right in and change things if they want to. Various how-tos provide details on how to perform extra functions, such as enabling shell access for users.

ClearOS supports external modules, that is extra services outside of those included by default. This is part of the design goal of the operating system which will hopefully foster collaboration and increase its range of useful features. It is possible to replace the default groupware server with a more sophisticated one or even create new custom modules, such is the flexibility.

The included Kolab groupware server is reasonable, however it appears that a connector for Outlook must be purchased separately, such as that from Toltec or KONSEC. A feature rich, but rather unattractive, web client is also included via Horde. Linux users can have native support through KDE’s Kontact application, or Mozilla’s Thunderbird and the Sync Kolab addon.

The installer is straight forward and supports both hardware and software RAID. During installation the user is able to select a number of services to include, however these can also be configured at a later stage via the web management interface.

The web-based management interface is very intuitive and easy to follow. Server features are broken up into sections, such as Directory, Network, System and Gateway, where admins can configure various components thereof. Everything, from adding a user to configuring an IPSec VPN is a matter of a few simple steps. Within 5 minutes an administrator can have a fully functional Windows domain server, with all the bells and whistles. Pretty neat, eh?

Also built into the interface are various reports, such as the state of system resources, traffic usage and analysis, mail and web server statistics, as well as good old system logs.

ClearOS Web Management Interface
ClearOS Web Management Interface

It would be good to see some improvements in the interface, to provide greater feedback. While installing packages for example, the interface appears to be doing nothing, while it is in fact downloading or installing. Reading the install log makes sense, but only if you know what you’re looking for. It would be great to see a simple feedback method in addition to the log. A rotating orange swirl while performing the task would suffice, turning green upon completion. It’s also a shame that there is no 64 bit version, however this might come at a later date if warranted.

Despite this, ClearOS is truly a decent replacement for Windows SBS. It has all the features yet is simple to manage and has the full power of Linux and free software right behind it.

Support options

Of course, another major component of any computer network is commercial support, which ClearFoundation also provides via their ClearCenter.

At the heart of this is the Clear Service Delivery Network, or ClearSDN. Registration to ClearSDN is free and in fact required in order to obtain the software updates it provides to keep your installation up-to-date and secure.

ClearSDN also offers various paid services, including:

“Software [antimalware] updates, content subscriptions, new features modules, technical support and cloud-based applications such as remote server backup.”

While the ClearOS software itself is open source, there are a few caveats. System updates are provided free of charge, however definition updates for the antimalware components are not.

ClearFoundation will also soon launch their own hardware appliance, called ClearBOX. This device will be pre-configured with ClearOS, certified and tested. So while anyone can download the software and install it on a server, those looking for an even more complete package should be able to find it soon enough.

ClearCenter also encompasses commercial support via ClearCare:

“ClearCARE is the innovative method that customers use to obtain technical support for ClearOS, ClearSDN and ClearBOX. Services are provided using a credit system with flexible purchase and payment terms.”

Finally, ClearFoundation has created a Web 2.0 community portal for everything related to ClearOS. It’s a single place where ClearOS users can get support and interact with each other via a friendly interface.

When it comes to ClearOS, you are not left out on your own. High quality commercial support is available to ensure servers run smoothly, which is something important to business.

Roll out the red carpet

Overall, this product is truly excellent. It serves the purpose of a drop in, easy to use Windows Small Business Server replacement and performs all required functions well. It has all of the services required of a server for a small to medium business network, plus several more to boot. The installation is simple and the interface reasonably intuitive enough that non-Linux admins can look like pros.

Hopefully over time it will grow and develop into an even more robust platform with some higher enterprise functions, such as clustering. It would be great to be able to expand an install over multiple machines with replication. It will be exciting to see where this operating system will go. Hopefully with a little more success and notoriety it can become a serious contender in the worldwide market. In the mean time however, it’s here and it’s ready to serve.

Comments on "The Small Business Server Replacement is Clear(OS)"


Hi, regarding the summary at the end of your article I\’d like to point you to the Univention Coproate Server (UCS) which is a Debian based server system with a very similar software stack. It scales from small business up to really big installations with more than 80.000 users.

UCS additionally includes an LDAP replication mechanism, a web based management system with a policies that you can apply to numerous objects like users, groups aso., a customized Linux desktop also for mobile PC devices that are not constantly connected to the domain, a Thin Client infrastructure and a strong integration of the major groupware solutions Scalix, OpenExchange, Zarafa and by default Kolab.

I\’d be keen to know what you say about this system -> http://www.univention.de/ (the manual is in English, the website not yet).


Jan Christoph


Hi Jan,

I\’m sure that there are lots of similar distros around the place. It\’s a good market to try and break into!

Univention looks interesting, but if there is no free version for businesses you\’re unlikely to get a whole lot of traction. I think that the ClearFoundation is good – free OS and extra paid for services.




Thanks for the post. Pretty good analysis of the disruption opportunities in the SBS market. I recently wrote a post in my blog pointing out very similar conclusions (http://blogs.ebox-platform.com/icorreas/2009/12/29/disrupting-the-market-of-smb-servers/).

We know pretty well ClearOS, as they are the most similar project to our own OSS product, eBox Platform (www.ebox-platform.com).

The main differences are:
* Some different functionalities (ClearOS has database integration and eBox does not, whereas eBox has VoIP integration and ClearOS does not)
* eBox integration framework seems to be more compact and better structured (this, of course, is a biased opinion and I would encourage anyone interested in this point to compare by themselves)
* ClearOS is based in CentOS, whereas eBox is based in Ubuntu LTS (and is also integrated as a package in Ubuntu Server)
* ClearOS integration technology is older than eBox
* ClearOS business model is tending toward serving the end-customer directly, whereas eBox is more focused in the channel (VARs and MSPs, with the eBox Control Center as the core of its proposal)

I hope I managed to add some interesting information to the article.



the answer is more than clear OS . Multiple distro are doing the same stuff. sometimes you even have to pay if you go over 5 users… wich seems not to be for clearos anymore… . an exemple : SME server is a good alternative. sme users : don\’t jump the ship too fast, the water could be colder than you think…. I am thinking about documentation, users community, etc etc. True we\’re waiting sme 8 , Once this will be out, sme will come back stronger than ever.


This article is wishful thinking becasue its main point, that OpenOS can be used by Microsoft shops to easily replace their servers, is unrealistic. I am a big fan of Linux but it requires an IT staff that is trained appropriately. The statement \”The installation is simple and the interface reasonably intuitive enough that non-Linux admins can look like pros\” is simply not true unless there is a Linux pro on hand to do the initial installation and setup.


While this may be a perfectly good product, I have to agree with mmccloskey: When windows techs who do not \’get it\’ about the approach, the philosophy, the tools available and the debugging approach on Unix-style systems try to admin a Linux box, the results are not good. At best, they give up quickly and everyone forgets about it, at worst you have a negative advert for everything Linux.

That\’s not to say that it can\’t be done, just it isn\’t going to happen until they can take on board a different mindset.

BTW, I did briefly try ClarkConnect way back when and the problem then was that it was unclear what happened after the install: ok, it made a good job of giving you a system that did something in short order, but I had little idea of the nuts and bolts of what it had done and how the configuration could be tweaked if requirements changed. Had I had more Unix experience at that time, this would have been easy enough to overcome, but, as it was, I just felt lost and that it was easier to start again with a more conventional distribution.

I suspect that admins who have only had windows training and Microsoft courses (did anyone say brainwashing?) will be in a similar position, if they try OpenOS.


mmccloskey said:

This article is wishful thinking becasue its main point, that OpenOS can be used by Microsoft shops to easily replace their servers, is unrealistic.

No it is not! Have you checked out ClearOS yourself?

I am a big fan of Linux but it requires an IT staff that is trained appropriately.

Linux is easier to learn then winblows. I have learned way more in seven years with Linux than I did in eleven years with winblows. I stopped using winblows six years ago. Are you still a winblows user?

The statement \”The installation is simple and the interface reasonably intuitive enough that non-Linux admins can look like pros\” is simply not true unless there is a Linux pro on hand to do the initial installation and setup.

How do you know it is not true? Again, have you checked ClearOS out yourself?


@mmccloskey & @mark_w
Perhaps lots of Windows admins won\’t touch it because it\’s simply NOT Windows, but Linux never will be. Those people are lost anyway. Users who have at least some motivation to try it on the other hand will need something that sets most things up out of the box, which ClearOS does.

I do mention in the article the need for some motivation to migrate to Linux in the first place (whether that\’s reliability, cost, features or whatever).

And don\’t forget that there are plenty of Unix admins who were ex-Windows admins. They had to try Linux at some point for some reason..




You have done a great job figuring out the details regarding ClearOS and ClearSDN without connecting with anyone from ClearCenter, which should help to prove the point that ClearOS is very simple.

Your review and assessment of ClearOS has been done with taste and has been a breath of fresh air. We look forward to reviewing additional assessments, thoughts and most of all feedback in areas where we can improve both ClearOS (Truly Free Software) from the ClearFoundation / the World and ClearSDN (Services) from ClearCenter. http://www.clearcenter.com

Michael Proper
Chairman – ClearFoundation
CEO – ClearCenter
O: +1.801.851.5556
C: +1.801.361.6453


Ignacio, Jan and Barrief,

Are we Crabs or Penguins?


Let\’s be Penguins and work together to rise the tide for all.

Michael Proper
Chairman – ClearFoundation
CEO – ClearCenter
O: +1.801.851.5556
C: +1.801.361.6453


M. McCloskey,

If you are serious about using a technology that will help you provide more value as an IT service provider for Business\’s, Distributed Enterprise or to manage your Home, please give ClearOS a try and call my cell if you need any help. 801.361.6453 or I am sure anyone on http://www.clearfoundation.com would be more then willing to help you!

Here is to a great 2010!

Michael Proper
Chairman – ClearFoundation
CEO – ClearCenter
O: +1.801.851.5556
C: +1.801.361.6453



I believe it is good that there are several commercial open source alternatives to SBS: it gives credibility to Linux as an alternative and it helps driving adoption from pragmatic customers. I also believe there is market enough for several vendors, especially if they have different approaches in their value proposition, which is our case.

However, I believe that if we really want to stir the market, we need more articles describing several Linux-based alternatives to SBS and giving different choices to the customers. Only then we will be able to tackle the large segments of the market.



Hello folks,

I agree that it is definitely time for distro\’s such as ClearOS and SME Server/Gateway 7.4 to take over the placement of SBS services, but as I see it they each have some ways to go before they make it. Don\’t get me wrong, I have been an avid linux user for some time – in fact I am typing this in firefox on mandriva 2010. But even ClearOS has it\’s flaws.

I downloaded the iso yesterday and have installed it as a virtual system, and at first glances the install in easy enough however only on initial boot one point which concerns me is that on login you use the root user instead of something more secure.

SME may be more security conscious however where it falls down is the MySQL & PHP versions are still in the 4.x versions. If a user wishes to host a page they are restricted to earlier versions of CMS (Joomla, Drupal, etc). However one of their saving graces is that there are several apps which are free.

ClearOS have limited apps which are allocated as open-source, please someone correct me if I am wrong?

How this equates to this topic is that while either one is very suitable the focus should be to design its functionality to drop-in replace services currently held by MacroShaft (personal opinion) products.

In this I am endeavoring to be as un-biased as possible but I admit I have been using an SME Server/Gateway for some years happily. For those who wish to find out more on SME the site is http://wiki.contribs.org/Main_Page.




Have you considered Kerberos integration in ClearOS, as you already support LDAP? I think that\’s really necessary to provide an Active Directory replacement, instead of a Windows NT replacement.



I have 15 years commercial experience installing and supporting linux. For this sort of platform we normally used SME Server. It\’s a fairly straight forward install and easy to manage.

I have a fire department that needs an inexpensive file server and I thought I would give ClearOS a try as it seems a bit more updated than SME currently and because it has been around for quite a while as Clark Connect previously. I have to say I was disapointed in it.

Installing it as Raid 1 you had to do the partitioning manually in the partitioner instead of there just being an option to install it as raid on discovered drives. No big deal just extra time for something that should have been a bit simpler I thought. Other than that the install itself was pretty simple. Just click ok ok ok mostly.

My dismay came once I finished installing it. It would boot up and I could get into the console interface but the graphical interface didn\’t work and and the console interface couldn\’t connect to port 82 that it kept asking to connect to on local host.

For a simple job like this I ran into enough issues that it wasn\’t worth my time as a linux professional to even bother working at trouble shooting it. I\’m currently installing SME. It just works even if it is a bit older. I would like to see it updated a bit but as this is going to just act as standalone server and not a gateway system I\’m not to worried about it.

For you guys at ClearOS. I\’m not sure what the problem was, I don\’t have the energy or time to dig into it and figure out what the deal is. I was looking for a product that just works. I\’m hope that my experience was atypical but if not you have a bit of a problem on your hands as this will turn people off quick. I will try new products once in a while just to see what is out there but if it involves a lot of configuration to install or doesn\’t work correctly once install then I move on. There are a lot of company\’s out there like me. They just need it to work out of the box.


    “the graphical interface didn\’t work and and the console interface couldn\’t connect to port 82″

    Wow. 15 years of supporting Linux & you still think it’s necessary to run a GUI on a server? You couldn’t read the site’s installation docs/user guide? Hummm…

    Access the Webconfig through your web browser at https://hostname_or_ip_address:81. You must have port 81 accessible to do this

    Funny how I found that in <10 secs. You sound more like a MCSE. The mind boggles.

    ps/ MCSE =



@audeojude, I\’m not sure what\’s happened there either, however I know that once you get it installed, you just use a web browser on any box in the network to connect to it on port 81 (it uses https, but will re-direct you).

Port 80 is of course reserved for running a web server on the box.

I\’m confident that after an install you should be able to log onto the configuration interface on port 81 and go from there.



@sglasser, Naturally Kerberos will be part of any Samba 4 implementation as Kerberos is a requirement for that to work properly. If you have a specific kerberos need right now, that package already exists and works fine. But it is in the command line space at this point.

Currently ClearOS has one of the best implementations of Samba right out of the box. The limitations that come with Samba 4 is that Samba 4 is NOT (yet) a file server offering and most people don\’t realize that. Samba 4 is an active directory server and there is no easy integration of the file services at this point. Currently, Samba 3 has the stable product because it has an authentication piece, the file services piece, the username/group binding piece, and the clustered services piece. To get Samba 4 to do that you currently have to hack in much of Samba 3 in order to be usable for anything more than a directory.

@audeojude, We can do better to make ClearOS easier. I\’m sorry that you had a bad experience and gave up. We could have done more in the documentation and the installation to make it easier to understand and more usable. Usually users that have that particular problem, of not being able to access the console screen, have some problem with their network configuration or with their network cards. As csmart said, configuration of the system from an outside workstation happens on port 81 and by default that is NOT open on the public side of the box if you use gateway mode.

ClearOS, like SME, has a thriving community and boards (www.clearfoundation.com) where many of the topics you mentioned are already asked and answered. We are keen on understanding the user\’s issues so that we can improve the product and make it easier and easier to use.

I told someone that my 12 year old son installed ClearOS by himself the other day. They told me, \’that\’s nothing. Get it so my grandmother can install it and you will know that you\’ve arrived\’. This is the goal I\’m working towards.


Every time I try to replace a microsoft server for a small business I am hit with some proprietary software that can\’t be replaced. Most recently it was some (really bad) form software that relied on a local microsoft SQL Server. I could have re-written the software (and improved its functionality) and converted their data to a mySQL or SQLlite database but they don\’t understand why and they don\’t want to use anything slightly different from what they\’re used too. So they\’ll keep throwing money and time at their janky set-ups until something breaks and they finally realize the catastrophe that is waiting.


@actionowl, yeah, this is still a problem, without a great solution other than porting it to something else..



To be honest I didn\’t even try to access the unit over the network. The issues I experienced were at the console level. I just figured if it wasn\’t even working correctly at the console level that I wouldn\’t put the time in to try and fix it or learn more. I rolled out a SME server and between installation and configuration at the clients site for users and shares it only took me a couple hours total. That is what I am looking for. Not to play with it but to have it just work, simple, easy to manage, decent feature set small office network server. When I need to do more complex setups I use ubuntu server and do the full blown tweak and configure. I will probably try clearOS out again sometime in the future when I feel like playing with something new. I do like checking out new products and alternatives to what I use most of the time. Like I said before it was probably not representative of clear OS most of the time, but I didn\’t have time to play with it when I couldn\’t even correctly get the console interface to come up once I had logged in at the console.

Good luck on it..



For the record I love Linux but most small business I have consulted for are stuck in a MS world. I have seen the same in govt agencies also looking to move away from MS so management can outsource easier. The small business are stuck using MS because their main server applications are windows based and has to be in a pure Windows environment. Others may have a member server but still need it to interact with Exchange and/or IIS. So maybe if we can get more Linux servers in place for small businesses then we will see more applications geared toward the Linux small business server. Again this is a challenge since what makes Linux so great is we have so many options. This is also a challenge for developers trying to decide what environment to build in. What window do they build it in KDE, Gnome, etc.? If I find this app in the right environment will the other major apps be in the same environment so I can get one easy to manage box? Lets face it, most end users AND windows admin are looking for a button to push or a wizard to start.

When I can convince a business to use a Linux server, I choose Debian instead of Ubuntu because I have found that Ubuntu package updates are much slower than Debian updates.


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Hello every body…

just to add some! ClearOS, Zentyal and SMEServer are both very good SBS. However i have to say that ClearOS (after spending more than 100H testing all solutions, and disruptions on update and upgrades) is better, or better… is faster, because i have tested all in same enviroment.

The only con… its they use CentOS distribution, and i really prefer Ubuntu, because they are kicking-ass’s with all they upgrade and implementations.

But life can’t be perfet, even if it’s wonderful :D

Greats to everyone and keep good jobs :D


ClearOS is released in Version 6.2 today.
And with the new Marketplace and (coming soon)Zarafa Groupware is it a very good alternative to sbs.


Simply put, it’s a matter of simplicity. If Microsoft makes a product that is easier to set up, manage, and configure for the end user, then Microsoft will get the business. If *nix can find a way to make an operating system that does not require digging around in man pages, forums, and manual configuration files before Microsoft does the same thing, they have a chance.

The biggest problem, however, is the flawed mindset behind the “free” concept. Money makes the world go ’round. Every “free” thing out there has a limited shelf life before it is abandoned when the need to capitalize comes along. Programmers have to pay their bills, too. Free will make sense when I can get a free car, free power, free internet, free medical care, free everything… and I don’t mean tax-payer provided, but truly free. The water company won’t work for free. Why the hell would a good software engineer?

Notice how many “free” things online are fading away, trying to be advertiser supported at first then switching to a paid model or dying off? That’s because even something as simple as BANDWIDTH costs money. In the end, someone has to pay. Free is the biggest joke out there.


    You said, “Simply put, it’s a matter of simplicity. If Microsoft makes a product that is easier to set up, manage, and configure for the end user, then Microsoft will get the business…….Free is the biggest joke out there.”

    I think you totally miss the point. To begin with, the “free” part of open source software has little to do with cost, but a lot to do with the availability of the source code and the freedom to do with as you wish.

    Most small businesses do not initially set-up and configure, their own servers. They contract for these services usually with local IT services companies (which are often small businesses themselves).

    The cost savings of SBS’ like ClearOS come from the elimination of license fees. However, there is still a cost in labor for initial set-up and on-going management/administration. That labor cost can either be in-house or outsourced.

    The real benefit to the small business using open source is the “free”dom to totally control their own destiny. Reduced cost is great, but not the most valuable benefit of open source.


Ur article, “The Small Business Server Replacement is Clear(OS) | Linux Magazine” was indeed very well
worth writing a comment on! Merely desired to admit u really did a good job.
Thanks for your time -Wilma


I personally blog too and I am publishing something comparable to this excellent post,
“The Small Business Server Replacement is Clear(OS) | Linux
Magazine”. Would you care if perhaps I personallyapply a number of of your own tips?
Thanks for your effort -Elissa


This is the 3rd article, of your website I personally
went through. Still I personally love this specific 1, “The Small
Business Server Replacement is Clear(OS) | Linux Magazine” the best.
All the best -Oma


You actually make it seem so easy with your presentation but I find this matter to be really something that I
think I would never understand. It seems too complicated and extremely broad for me.
I’m looking forward for your next post, I’ll try to get the hang of it!


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