Time to Upgrade from Exchange 2003 | Microsoft Docs
Exchange 2003 mainstream support is already over. And, Exchange Server 2003 extended support ends on April 8, 2014. April 2014 will be here before you know it, so now is the time to start planning your upgrade. Back in 2011, we gave you a heads-up about Exchange 2003 support coming to an end in Time to Move from Exchange 2003. Since then, we've released Exchange Server 2013 and released more new features in Microsoft 365 and Office 365.
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