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On this site you can find important links for exchange patching:

March 2021 Quarterly Exchange Updates (and the nightmare began) Released: March 2021 Quarterly Exchange Updates – Microsoft Tech Community

March 2021 HAFNIUM Released: March 2021 Exchange Server Security Updates – Microsoft Tech Community

April 2021 Exchange Security Updates Released: April 2021 Exchange Server Security Updates – Microsoft Tech Community

May 2021 Exchange Security Updates Released: May 2021 Exchange Server Security Updates – Microsoft Tech Community

July 2021 Exchange Security Updates Released: July 2021 Exchange Server Security Updates – Microsoft Tech Community

See also Exchange June 2021 Quarterly Exchange Updates Released: June 2021 Quarterly Exchange Updates – Microsoft Tech Community

To check your system please use Exchange Health Checker

Some customers experience issues after July security updates about signing in to ECP or OWA. Here is a workaround: Can’t access OWA/EAC with expired OAuth certificate – Exchange | Microsoft Docs
NOTE: You should check the AuthCertificate BEFORE you update

New Exchange cumulative Update Exchange 2016 CU22 and Exchange 2019 CU 11

https://support.microsoft.com/en-us/topic/cumulative-update-11-for-exchange-server-2019-kb5005334-93fc6a41-faa4-424e-9dcb-27081360872b

https://support.microsoft.com/en-us/topic/cumulative-update-22-for-exchange-server-2016-kb5005333-ceb154d8-7116-43a5-83c1-205af7c43764

ATTENTION: see prerequisites (need to install IIS Rewrite Tool)


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