brad-x writes: "Kerio MailServer, like Zimbra, has until only recently been an 'almost but not quite' Exchange alternative. It has offered Outlook support and integration with Active Directory since 2002, but did not initially support groupware features such as calendaring and shared contacts properly until years later. It wasn't until 2007 that Kerio began to coalesce into an alternative to Exchange — and with the release of Kerio MailServer 6.5, its transformation into an Exchange killer is complete."
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