However, it may be unable to update other domains in the forest. The /PrepareDomain operation automatically runs in the Active Directory domain in which the /PrepareAD command is run. Installation will finish only if the user who initiated Setup has the appropriate permissions.Ībout 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. 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. Additionally, it will block a malicious request before it's handled by Exchange. For more details, see More about AMSI integration with Exchange Server. Microsoft Exchange Server 2016 now supports integration with Windows Antimalware Scan Interface (AMSI).
For more information about DST, 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 in later cumulative updates for Exchange Server 2016. Universal C Runtime in Windows (KB 2999226)Ĭumulative Update 22 for Microsoft Exchange Server 2016 was released on September 28, 2021. It 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.
This 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 Server by applying mitigations to address any potential threats against them.
This September 2021 cumulative update (CU) will install Exchange Emergency Mitigation (EM) service.