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 18 for Microsoft Exchange Server 2013 was released on September 19, 2017. Several nonsecurity issues are fixed in this cumulative update or a later cumulative update for Exchange Server 2013.
Issues that this cumulative update fixes
This cumulative update fixes the issue that is described in the following Microsoft Knowledge Base articles:
Cumulative update information
The setup process for Exchange Server 2013 identifies any missing prerequisites.
You may have to restart the computer after you apply this cumulative update package.
You don't have to make any changes to the registry after you apply this cumulative update package.
After you install this cumulative update package, you can't uninstall the package to revert to an earlier version of Exchange Server 2013. If you uninstall this cumulative update package, Exchange Server 2013 is removed from the server.
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.
Learn about the terminology that Microsoft uses to describe software updates.