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Released: September 2021 Quarterly Exchange Updates

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The_Exchange_Team
Platinum Contributor
Sep 28, 2021
Today we are announcing the availability of quarterly Cumulative Updates (CUs) for Exchange Server 2016 and Exchange Server 2019. These CUs include fixes for customer reported issues, all previously ...
Updated Nov 11, 2021
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LukasSMSFT's avatar
LukasSMSFT
Icon for Microsoft rankMicrosoft
Oct 04, 2021

Sam_T the steps to renew an Exchange certificate are described here: Renew an Exchange Server certificate | Microsoft Docs . The issue which is fixed with the latest CU has only affected the certificates created during the initial Exchange installation. 

The New-ExchangeCertificate cmdlet automatically generates certificates using SHA-256. You can also use the Exchange HealthChecker (https://aka.ms/ExchangeHealthChecker) to check the hash algorithm.

 

EDIT:

If you create a new auth certificate, make sure to configure it as next certificate via Set-AuthConfig (Set-AuthConfig (ExchangePowerShell) | Microsoft Docs) or follow these steps if it has already expired: https://aka.ms/HC-OAuthExpired