Service Pack 3 is a fully slip-streamed version of Exchange 2010. The following new features and capabilities are included within SP3:
- Coexistence with Exchange 2013:Customers who want to introduce Exchange Server 2013 into their existing Exchange 2010 infrastructure will need the coexistence changes shipping in SP3.
NOTE: Exchange 2010 SP3 allows Exchange 2010 servers to coexist with Exchange 2013 CU1, which is also scheduled to be released in Q1 2013. 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.
- Support for Windows Server 2012: With SP3, you can install and deploy Exchange Server 2010 on computers that are running Windows Server 2012.
- Support for Internet Explorer 10: With SP3, you can use IE10 to connect to Exchange 2010.
Service pack also resolves the issues that are described here