Mail and calendar
If you're looking for an open alternative to Microsoft Exchange, just slightly edges Zimbra as a enterprise-class e-mail and group calendar solution (through we still feel Zimbra's more innovative). "Enterprise" is the watchword here, since Scalix does a fine job using Linux clustering and failover features for maximum uptime. Scalix's AJAX console makes administration a snap, while the included Scalix ActiveSync lets wireless devices connect directly to the server for push e-mail, contact, and calendar updates.

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