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Exchange Y2K22 issue (a patch is available)
Announcement by Derek Curtis - 1/3/2022 at 8:46 AM
Employee Post
Not sure if everyone saw this, but Exchange 2016 and 2019 admins appear to have started out 2022 with a BANG!


While it's since been patched, the malware checking engine for Exchange broke due to an incorrect data type Microsoft used for the date. As a result, emails and messages were stuck in the transport queue. Good times. 

Here's info on some manual fixes if the patch hasn't made it to you just yet:
Derek Curtis
COO
SmarterTools Inc.
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