Cumulative Update 21 for Exchange Server 2013

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Notice

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:

Exchange Server build numbers and release dates

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.

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Summary

Cumulative Update 21 for Microsoft Exchange Server 2013 was released on June 19, 2018. This cumulative update includes fixes for nonsecurity issues and all previously released fixes for security and nonsecurity issues. These fixes will also be included in later cumulative updates for Exchange Server 2013.

This update also includes new daylight saving time (DST) updates for Exchange Server 2013. For more information about DST, see Daylight Saving Time Help and Support Center.

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Issues that this cumulative update fixes

This cumulative update fixes the issues that are described in the following Microsoft Knowledge Base articles:

4133605 Cmdlets to create or modify a remote shared mailbox in an on-premises Exchange environment
4133604 User can't log on to a POP/IMAP account by using NTLM authentication in Exchange Server 2013
4133618 Unexpected error occurs when running the Get-DatabaseAvailabilityGroupNetwork cmdlet in Exchange Server 2013
4133620 “HTTP 500 due to ADReferralException” when a user tries to view detail properties of mailboxes in a child domain in Exchange Server
4058473 An Office 365 primary mailbox user cannot be assigned full access permissions for an on-premises mailbox in Exchange Server
4094167 The MSExchangeRPC service crashes with a System.NullReferenceException exception in Exchange Server 2013
4095974 “System.InvalidOperationException” occurs when the "Enable-MailPublicFolder" cmdlet is run against a public folder in Exchange Server
4092041 Description of the security update for Microsoft Exchange Server 2013 and 2016: May 8, 2018
4294205 POP3 services intermittently stop in an Exchange Server 2013 environment
4294204 Changing "IsOutOfService" to "False" in an earlier Exchange Server version does not immediately update in a later Exchange Server environment

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Cumulative update information

Prerequisites

This cumulative update requires Microsoft .NET Framework 4.7.1.

A component that's used within Exchange requires a new Visual C++ prerequisite to be installed with Exchange Server. The prerequisite can be downloaded at Visual C++ Redistributable Packages for Visual Studio 2013. For more information, see KB 4295081.

The setup process for Exchange Server 2013 identifies any missing prerequisites. For more information about the prerequisites for the setup of Exchange Server 2013, see Exchange 2013 prerequisites.

Restart requirement

You may have to restart the computer after you apply this cumulative update package.

Registry information

You do not have to make any changes to the registry after you apply this cumulative update package.

Removal information

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.

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More Information

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.

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