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