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'500 Unexpected Error' when trying to create a user mailbox in ECP.Р’В For more information, see KBР’В 5001874.

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Then, the Exchange admin user can start Setup.Р”Р„utodiscover Event ID 1 occurs after you installР’В Cumulative Update 14 for Exchange Server 2016. To avoid the errors, either the user should join Schema Admins and Enterprise Admins groupsР’В or another user in Schema Admins and Enterprise Admins groups should manually run /PrepareAD for this Cumulative Update first. For more information, visit: (EXCHG.150)/ms.

Global updates need to be made to Active Directory, and this user account isn't a member of the 'Enterprise Admins'group. Therefore, a domain administrator should run the /PrepareDomain in other domains in the forest.Р”В«ecause 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 will fail, and you receive the following error messages. However, it may be unable to update other domains in the forest. The /PrepareDomain operation automatically runs in the ActiveР’В Directory domain in which the /PrepareAD command is run. Installation will finish only if the user who initiated SetupР’В has the appropriate permissions.Р”Р„bout the /PrepareDomain operation in multidomain In multidomain Active Directory forests in which Exchange is installed or has been prepared previously by using the /PrepareDomain option in Setup, this action must be completed after the /PrepareAD command for this cumulative update has been completed and the changes are replicated to all domains.Р’В Setup will try to run the /PrepareAD command during the first server installation. This feature enables an AMSI-capable antivirus or antimalware solution to scan content in HTTP requests that're sent to the Exchange Server.Р’В Additionally, it will block a malicious request before it's handled by Exchange.Р’В For more details, see More about AMSI integration with Exchange Server.

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Microsoft Exchange Server 2016 now supports integration with Windows Antimalware Scan Interface (AMSI). For more information about DST,Р’В see Daylight Saving Time Help and Support Center. This update also includes new daylight saving time (DST) updates for Exchange Server 2016. These fixes will also be included inР’В later cumulative updates for Exchange Server 2016. Universal C Runtime in Windows (KB 2999226)Р”В¬umulative Update 22Р’В for Microsoft Exchange Server 2016Р’В was released on September 28, 2021.Р’В ItР’В includes fixes for nonsecurity issues and all previously released fixes for security and nonsecurity issues. Note The app pools are restarted as a part of the IIS Rewrite module installation. ThisР’В CU has the following additional prerequisites: It uses the cloud-based Office Config Service (OCS) to check for and download available mitigations and to send diagnostic data to Microsoft. This service is designed to help secure your servers that are running Microsoft Exchange ServerР’В by applying mitigations to address any potential threats against them.

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ThisР’В September 2021 cumulative update (CU)Р’В will install Exchange Emergency Mitigation (EM) service.

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