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This update also includes new daylight saving time (DST) updates for Exchange Server 2019. For more information about DST, see Daylight Saving Time Help and Support Center.

Improvements and fixes in this update

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

  • 5027150 Enable Modern Auth for pure On-Premises Exchange users

  • 5026134 “InvalidRecipientsException" when you try to run MRM

  • 5026135 CertificateDeploymentServicelet failure in multiple domain forest Exchange deployments

  • 5026136 Microsoft Exchange Transport doesn't re-encrypt IRM messages

  • 5026138 Users receive reminders although the meeting reminder is set to None

  • 5026139 You can't move the public folder mailbox

  • 5026142 Journal message returns "ConversionFailedException"

  • 5026143 OAB shadow distribution threshold must be reduced or made configurable

  • 5026146 Expiry notification is sent to moderator and sender for approved and delivered messages

  • 5026147 BlockLegacyAuthentication fail Organization Policy because of BackendRehydrationModule implementation

  • 5026149 Group metrics generation doesn't finish in multidomain environment

  • 5026150 Edge server Filtering Agent removes journal attachments

  • 5026151 Oab-Processing-Threshold is set to 0 for On-Premises

  • 5026152 Microsoft Exchange ActiveSync or Current Requests counter inaccurately counts requests

  • 5026153 Delivery Flow Control setting override is now available

  • 5026154 On-premises Exchange has 35MB file size limit for online archiving

  • 5026155 "No support for this operation" error on an Exchange 2019 DAG member server

  • 5026156 Outlook search fails in a shared On-Premises mailbox if the primary user mailbox is migrated to Exchange Online

  • 5026158 The body of recurring meeting is not clear if it has Chinese characters

  • 5026159 IconIndex returns Default value when Server Assisted Search is used in Outlook

  • 5026266 "Could not start MS Exchange Service Host service" error and Exchange stops responding

  • 5026267 OWA stops responding in an Exchange 2019 and 2016 coexistence topology

  • 5026268 Store Worker process crashes and returns "System.NullReferenceExceptions" multiple times per day

  • 5026269 Block deserialization error when using eDiscovery

  • 5026271 IIS URL Rewrite Module link is incorrect

  • 5026273 Outlook configuration fails in Android or iOS

  • 5026274 Hybrid Agent Validation fails after Extended Protection is enabled

  • 5026277 Mail configuration fails on iOS device after Extended Protection is enabled

  • 5026278 Mailbox migration fails after Extended Protection is enabled

Known issues in this cumulative update

  • In multidomain Active Directory (AD) forests in which Exchange Server is installed or has been prepared previously by using the /PrepareDomain option in Setup, this action must be run after the /PrepareAD command for this cumulative update run and the changes are replicated to all domains. Setup will try to run the /PrepareAD command during the first server installation. Installation will finish only if the user who initiated Setup has the appropriate permissions.


    • If you have ever skipped a Cumulative Update (for example, you are upgrading from an earlier version before Cumulative Update 2 for Exchange Server 2019), or if this is a first Exchange Server installation in the AD, then this "Known issues" section should no longer apply. 

      • About the /PrepareDomain operation in multidomain:

        The /PrepareDomain operation automatically runs in the Active Directory domain in which the /PrepareAD command is run. However, it may be unable to update other domains in the forest. Therefore, a domain administrator should run the /PrepareDomain in other domains in the forest.

        • About the permission question:

          Because the /PrepareAD is triggered in Setup, if the user who initiates Setup isn't a member of Schema Admins and Enterprise Admins, the readiness check fails and you receive the following error messages:

          Error: The Active Directory schema isn't up-to-date, and this user account isn't a member of the "Schema Admins" and/or Enterprise Admins' groups. 

          Error: Global updates need to be made to Active Directory, and this user account isn't a member of the "Enterprise Admins" group. 

        • To avoid the errors, either the user should join the Schema Admins and Enterprise Admins groups or another user in Schema Admins and Enterprise Admins groups must first manually run the /PrepareAD command for this cumulative update. Then, the Exchange admin user can start Setup.

    • Autodiscover Event ID 1 occurs after you install Cumulative Update 3 for Exchange Server 2019. For more information, see KB 4532190.

Get Cumulative Update 13 for Exchange Server 2019

Method 1: Volume Licensing Center

Note The Cumulative Update 13 package can be used to run a new installation of Exchange Server 2019 or to upgrade an existing Exchange Server 2019 installation to Cumulative Update 13.

Method 2: Microsoft Download Center

You can get the standalone update package through the Microsoft Download Center.

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