New Quarterly Exchange Server Updates Released



Yesterday Microsoft announced the release of several new Exchange Server Updates (December updates). The following updates was released:

Exchange 2013

Cumulative Update 11 contains the latest set of fixes and builds upon Exchange Server 2013 Cumulative Update 10. The release includes fixes for customer reported issues, minor product enhancements and previously released security bulletins.

Customers running any previous release of Exchange Server 2013 can move directly to Cumulative Update 11. Customers deploying Exchange Server 2013 for the first time may skip previous releases and start their deployment with Cumulative Update 11 directly.

Cumulative Update 11 does not include updates to Active Directory Schema, but may add additional RBAC definitions to your existing configuration. PrepareAD should be executed prior to upgrading any servers to CU11. PrepareAD will run automatically during the first server upgrade if Setup detects this is required and the logged on user has sufficient permission.

Exchange 2007


Exchange 2010


Both these updates, contain important changes and updates, shortly described here:

  • Cumulative Update 11 and Update Rollup 12 each contain a time zone calculation fix to resolve the issue reported in KB3048372 – Exchange Calendar Items are shifted incorrectly when some Windows DST updates are applied. Customers in impacted time zones are encouraged to deploy these updates to address the issue identified after the release of the OS time zone changes in KB3039024.
  • Cumulative Update 11 also includes a change in behavior when deploying/administering Exchange Server 2013 in a co-existent manner with Exchange Server 2010 or 2016. These changes are outlined in the following blog article: Exchange Management Shell and Mailbox Anchoring.


Exchange 2016

There is no update for Exchange 2016, The first update for Exchange Server 2016 is scheduled for release at next quarterly update circle, which then will be released as Exchange Server 2016 CU1.


Exchange Hybrid

Important for Hybrid deployments: Customers in hybrid deployments where Exchange is deployed on-premises and in the cloud, or who are using Exchange Online Archiving (EOA) with their on-premises Exchange deployment are required to deploy the most current (e.g., CU11) or the prior (e.g., CU10) Cumulative Update release.


Always test the deployment of any update in your lab environment to determine the proper installation process for your production environment.

For information on extending the schema and configuring Active Directory, please review the appropriate TechNet documentation.

Reference: Released: December 2015 Quarterly Exchange Updates