Exchange Server 2013 CU3 has been released and contains fixes for several critical problems in Exchange 2013, and Microsoft recommends it to all customers.
As with the other Exchange 2013 updates this version is a complete installation, so on new installation of Exchaneg 2013, you don’t need to install the RTM or any other versions first.
Have a look at the Exchange Team blog for importen information about this update
Get the update here
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