We have now published most of the information from this blog post as a part of our official documentation, You can find it here: Exchange Server update FAQ.
It is very important to keep updatin...
Updated Nov 27, 2023
Version 9.0
Blog Post
I know, that patching Exchange is really hard work and most of the time it works as expected, but the last 3 CUs (18-20) for Exchange 2016 opened one bug by another, leading to the misery we saw in March. Admins had to install buggy CUs to get protected against Hafnium attacks. ExchangeAdmins are waiting for "clean" CUs... QualityControl should be alarmed, you are loosing customers, not everyone is able / allowed to use Microsoft365 solutions...