This update is no longer available because Cumulative Update 22 for Exchange Server 2013 (4345836) was released on February 12, 2019. You can install the latest Exchange Server 2013 update to fix the issues that are described in this article.
Cumulative Update 19 for Microsoft Exchange Server 2013 was released on December 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 adds support for .NET Framework 4.7.1. This cumulative update also fixes the issues that are described in the following Microsoft Knowledge Base articles:
- 4046316 MAPI over HTTP can't remove client sessions timely if using OAuth and the resource has a master account in Exchange Server 2013
- 4046205 W3wp high CPU usage in Exchange Server 2013
- 4046182 Event ID 4999 or 1007 if diagnostics service crashes repeatedly in Exchange Server 2013
- 4056329 Can't access EWS from Outlook/OWA add-ins via makeEwsRequestAsync in Exchange Server 2016 and Exchange Server 2013
- 4045655 Description of the security update for Microsoft Exchange: December 12, 2017
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 do not 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 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.