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Fjan11 writes
"Over 150 man-years of work were added to the Open Source community today when Zarafa decided to put their successful Exchange server replacement under GPLv3. This is not just the typical mail-server-that-works-with-Outlook, it is the whole package — including 100% MAPI, web access, tasks, iCal and Activesync. (The native syncing works great with my iPhone!) Binaries and source are available for all major Linux distros."