The Exchange team is announcing today the availability of our latest quarterly update for Exchange Server 2013 and Exchange Server 2010 Service Pack 3 Update Rollup 11.
Cumulative Update 10 for Exchange Server 2013 and UM Language Packs are now available on the Microsoft Download Center. Cumulative Update 10 contains the latest set of fixes and builds upon Exchange Server 2013 Cumulative Update 9. The release includes fixes for customer reported issues, minor product enhancements and previously released security bulletins, including MS15-103. A complete list of customer reported issues resolved can be found in Knowledge Base Article KB3078678. Customers running any previous release of Exchange Server 2013 can move directly to Cumulative Update 10. Customers deploying Exchange Server 2013 for the first time may skip previous releases and start their deployment with Cumulative Update 10 directly.
Cumulative Update 10 does not include updates to Active Directory Schema, but does include additional RBAC definitions requiring PrepareAD to be executed prior to upgrading any servers to CU10. PrepareAD will run automatically during the first server upgrade if Setup detects this is required and the logged on user has sufficient permission.
Read more at source: http://blogs.technet.com/b/exchange/archive/2015/09/15/released-september-2015-quarterly-exchange-updates.aspx