Released: September 2020 Quarterly Exchange Updates

Published Sep 15 2020 07:00 AM 45.6K Views

Today we are announcing the availability of quarterly servicing cumulative updates for Exchange Server 2016 and 2019. These updates include fixes for customer reported issues as well as all previously released security updates. 

A full list of fixes is contained in the KB article for each CU, but we wanted to highlight the following.

Calculator Updates

A few bug fixes are included in this quarterly release of the Exchange Sizing Calculator. The calculator was updated to ensure CPU usage was correctly calculated in some scenarios and an issue in which when the second node was removed in worst case failure scenario, and which resulted in a zero transport DB size when Safety Net was enabled was also resolved.

Surface Hub Teams and Skype Experience

When Exchange Server 2019 CU5 and Exchange Server 2016 CU16 were released we subsequently discovered issues with Surface Hub devices configured with on-premises mailboxes. In those cases if both the Teams and Skype for Business clients were installed side by side, the Surface Hub would pick the incorrect client when joining meetings. The CU’s issued today resolved these issues.

Release Details

The KB articles that describe the fixes in each release and product downloads are available as follows:

Additional Information

Microsoft recommends all customers test the deployment of any update in their lab environment to determine the proper installation process for your production environment. For information on extending the schema and configuring Active Directory, please review the appropriate documentation.

Also, to prevent installation issues you should ensure that the Windows PowerShell Script Execution Policy is set to “Unrestricted” on the server being upgraded or installed. To verify the policy settings, run the Get-ExecutionPolicy cmdlet from PowerShell on the machine being upgraded. If the policies are NOT set to Unrestricted you should use the resolution steps in here to adjust the settings.

Additionally, if you plan to install any Cumulative Update using the unattended option with either PowerShell or Command Prompt, make sure you specify either the full path to the setup.exe file or use a “.” in front of the command if running it directly from directory containing the update. If you do not the Exchange Server Setup program starts and may indicate that it completed successfully, though it has not. Read more here.

Reminder: Customers in hybrid deployments where Exchange is deployed on-premises and in the cloud, or who are using Exchange Online Archiving (EOA) with their on-premises Exchange deployment are required to deploy the currently supported cumulative update for the product version in use, e.g., 2013 Cumulative Update 23; 2016 Cumulative Update 18 or 17; 2019 Cumulative Update 7 or 6.

For the latest information on the Exchange Server and product announcements please see What's New in Exchange Server and Exchange Server Release Notes.

Note: Documentation may not be fully available at the time this post is published.

The Exchange Team

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‎Oct 14 2020 10:44 AM