This update is no longer available. To fix the issues that are described in this article, install the latest Microsoft Exchange Server update from the following Microsoft Docs article:
Microsoft provides download files only for N-2 versions for an Exchange Server cumulative update (CU), where "N" is the latest CU. The latest CU can be used to recover servers that are running Exchange Server. This includes servers that have a previous CU installed.
Cumulative Update 11 for Microsoft Exchange Server 2013 was released on December 15, 2015. Several nonsecurity issues are fixed in this cumulative update or a later cumulative update for Exchange Server 2013.
Issues that the cumulative update fixes
This update also includes new daylight saving time (DST) updates for Exchange Server 2013. For more information about DST, go to Daylight Saving Time Help and Support Center.
For more information about the deployment of Exchange Server 2013, see Release Notes for Exchange 2013.
For more information about the coexistence of Exchange Server 2013 and earlier versions of Exchange Server in the same environment, see Exchange 2013 System Requirements.
For more information about other Exchange updates, see Exchange Server Updates: Build numbers and release dates.
See the terminology that Microsoft uses to describe software updates.