If you’re still running Exchange Server 2010 RTM (in other words the original release, not Service Pack 1) then you might want to speed up your plans to upgrade to SP1.
Support for Exchange Server 2010 RTM ends on October 11, 2011.
If this is a surprise to you then check out the Microsoft Support Lifecycle page for Exchange Server 2010 that explains all of the important dates you need to be aware of for full support of your Exchange environment.
