Microsoft has released security updates (SUs) for vulnerabilities found in:
Exchange Server 2013
Exchange Server 2016
Exchange Server 2019
IMPORTANT: Starting with this release of Securit...
Updated May 27, 2022
Version 21.0
Blog Post
The post is a bit confusing as to when the /PrepareAllDomains should be run.
The diagram says after, and the FAQ lists it twice. The FAQ says before on one line, and after on another.
Instructions seem to indicate that we should /PrepareAllDomains after May 2022 SU is installed; is that correct?
Yes. The May 2022 SU package updates files in Exchange server folders when it is installed. That is why once those files are updated (SU is installed) – we ask you to go and explicitly /PrepareAllDomains using setup from \v15\Bin folder
Can we run /PrepareAllDomains before all Exchange servers are updated with May 2022 CU?
Yes. There is no dependency between running of /PrepareAllDomains and installation of updates on all servers. /PrepareAllDomains should be run when you are ready to address that particular CVE.
Can you confirm that point or at least remove the conflicting info?