The article say: In Exchange 2010, retention tags aren't supported for the Calendar and Tasks default folders. The Managed Folder Assistant doesn't process items in these folders. ...but that changed in Exchange 2010 SP2 RU4, so be aware of that.See: http://blogs.technet.com/b/exchange/archive/2012/08/14/calendar-and-tasks-retention-tag-support-in-exchange-2010-sp2-ru4.aspx
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