In addition to the customer reported issues resolved in previous rollups, this service pack also resolves the issues that are described in the following Microsoft Knowledge Base (KB) articles: Details of our regular Exchange 2010 release rhythm can be found in Exchange 2010 Servicing. Customer Requested Fixes: All fixes contained within update rollups released before SP3 will also be contained within SP3.Support for Internet Explorer 10: With SP3, you can use IE10 to connect to Exchange 2010.
Support for Windows Server 2012: With SP3, you can install and deploy Exchange Server 2010 on computers that are running Windows Server 2012.Customers can test and validate this update in a representative lab environment prior to rolling out in their production environments as an important coexistence preparatory step before introducing Exchange Server 2013 CU1. NOTE: Exchange 2010 SP3 allows Exchange 2010 servers to coexist with Exchange 2013 CU1, which is also scheduled to be released in Q1 2013.
Earlier last year, we announced that Exchange 2010 Service Pack 3 would be coming in the first half of 2013.