Zarafa is the number 1 MS Exchange alternative for Linux servers. With the complete implementation of the MAPI protocol, Zarafa gives users the most stable Outlook sharing. Via the opensource project Z-Push people can synchronize PDA\â€™s and Smartphones. With the Zarafa AJAX based webaccess you can access all your data wherever you are, see also http://demo.zarafa.com
The Dutch healthcare organisation Interakt Contour saved $100.000 by choosing Red Hat & Zarafa as the alternative for MS Exchange for 800 users.