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Cumulative Update 12 for Microsoft Substitution Server 2019 was released on Apr xx, 2022. It 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 2019.

This update besides includes new daylight saving time (DST) updates for Exchange Server 2019. For more information almost DST, run into Daylight Saving Fourth dimension Help and Support Center.

New features in this cumulative update

To forbid misuse of UNC paths by attackers, parameters that take UNC paths as inputs volition no longer be usable in Exchange Server PowerShell cmdlets or the Commutation Admin Center. For more information, see the following Knowledge Base commodity:

5014278 Changes in Substitution Server PowerShell cmdlets and Exchange Admin Center for UNC path inputs

Known issues in this cumulative update

The MSExchangeServiceHost service crashes repeatedly and Event ID 4999 is logged in the Windows Application event log. For more data, see Commutation Service Host service fails after installing March 2022 security update.
Symptom:
The Get-MailboxDatabaseCopyStatus cmdlet from an Exchange Server 2013 server fails confronting databases on Exchange Server 2019 and 2016 servers and returns Error 0xe0434352 from RpccGetCopyStatusEx4.

Workaround:
Run Get-MailboxDatabaseCopyStatus from an Exchange Server 2019 or 2016 server.
Symptom:
Checking the Exchange Server 2019 or 2016 database condition from the Commutation admin eye (EAC) might fail and return an "HTTP 500" or "Your request couldn't be completed. Please try once more in a few minutes" fault message.

Workaround:
Make sure that the admin mailbox is on an Exchange Server 2019 or 2016 server. If the admin account has no mailbox, brand sure that all mediation mailboxes (especially the "SystemMailbox{bb558c35-97f1-4cb9-8ff7-d53741dc928c}") are on an Exchange Server 2019 or 2016 server.
The Get-EmailAddressPolicy cmdlet fails and returns "Microsoft.Exchange.Diagnostics.BlockedDeserializeTypeException."
"Cannot Send Mail - Your mailbox is full" mistake when you employ iPhone mail to send very large attachments. For more information, see KB 5004622.

Problems that this cumulative update fixes

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

5012757 "Migration user... can't be found" mistake when using Start-MigrationUser afterward batch migration fails
5012758 Start-MailboxAssistant is not bachelor in Substitution Server 2019
5012760 You lot can't access OWA or ECP after installing the July 2021 security update
5012761 External attendees encounter "Send the Response Now" although no response was requested in Exchange Server
5012762 PST cosmos is unexpectedly triggered again during multiple mailbox export
5012765 Electronic mail stuck in queue starting from "2022/i/one 00:01:00 UTC+0" on all Exchange on-premises servers
5012766 Transport Services neglect repeatedly because of * Accepted Domain
5012768 Showtime-MigrationUser and Stop-MigrationUser are unavailable for on-premises Commutation Server 2019 and 2016
5012770 No response from public folder for users migrating to Microsoft Exchange 2019
5012772 Items are skipped at the kickoff of a new search page request
5012773 OWAMailboxPolicy is bypassed and high resolution profile images can be uploaded
5012774 Can't change default path for Trace log data in Exchange Server 2019 and 2016
5012775 No boosted global itemize column in the address volume service logs
5012776 Exchange Server 2019 aid link in OWA redirects users to online assist for Commutation Server 2016
5012777 Can't find forwarded messages that contain attachments in Commutation Server 2019
5012778 Exchange Server stops responding when processing PDF files with fix transport rule
5012779 Invalid new auth certificate for servers that are not on UTC time zone
5012780 Disable-Mailbox does non remove LegacyExchangeDN attribute from on-premises Exchange 2019
5012781 Commutation Server 2019 and 2016 DLP doesn't detect Chinese resident ID card numbers
5012782 MS ExchangeDiagnostic Service causes errors during service startup and initialization in Microsoft Exchange 2019
5012783 Can't restore information of a mailbox when LegacyDN is empty in the database
5012784 Exchange 2016 CU21 and Exchange 2019 CU10 cannot save "Custom Attributes" changes in EAC
5012785 Read Only Domain Controllers (RODCs) in other domains practice not get desired permissions
5012786 Forwarded meeting appointments are blocked or considered spam
5012787 Download domains created per CVE-2021-1730 don't support ADFS authentication in OWA
5012789 Can't use Copy Search Results subsequently eDiscovery & Hold search
5012790 OWA doesn't remove the "loading" paradigm when a bulletin is opened in Chrome and Edge browsers
5012791 MailboxAuditLog doesn't work in localized (non-English) environments
5012829 Grouping metrics generation fails in multidomain surroundings

Go Cumulative Update 12 for Commutation Server 2019

Download Middle

Download Cumulative Update 12 for Exchange Server 2019 (KB5011156) now

Book Licensing Heart

To get Cumulative Update 12 for Commutation Server 2019, go to Microsoft Volume Licensing Center.

Note The Cumulative Update 12 package tin can be used to run a new installation of Exchange Server 2019 or to upgrade an existing Exchange Server 2019 installation to Cumulative Update 12.

Cumulative update information

Prerequisites

This cumulative update requires Microsoft .NET Framework 4.8.

A component that's used within Exchange Server requires a new Visual C++ component to be installed together with Exchange Server. This prerequisite tin exist downloaded at Visual C++ Redistributable Package for Visual Studio 2012.

For more information near the prerequisites to prepare up Exchange Server 2019, see Substitution 2019 prerequisites.

Restart requirement

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

Registry data

You don't have to make any changes to the registry after you lot apply this cumulative update package.

Removal information

After you install this cumulative update bundle, you can't uninstall the package to revert to an earlier version of Commutation Server 2019. If you uninstall this cumulative update package, Exchange Server 2019 is removed from the server.

File information

File hash data

File name	SHA256 hash
ExchangeServer2019-x64-cu12.iso	77EDADA9D46B6539B18A187ACDDA6A8310C812C1D7F9C8E718CC372A323FE803

More than information

References

Learn well-nigh the terminology that Microsoft uses to describe software updates.

Modify history

The post-obit table summarizes some of the most important changes to this topic.

Date	Description
August 30, 2021	Added a "New feature in this cumulative update" department.
September 28, 2021	Added "Notice" at the top of the article.
Apr 20, 2022	Added a new feature to the "New features in this cumulative update" section (changed "feature" to "features").

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Source: https://support.microsoft.com/en-au/topic/cumulative-update-12-for-exchange-server-2019-kb5011156-6a4e598a-876c-4ff1-9cfa-f7b87246f1d8