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Exchange Team Blog
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Released: July 2021 Exchange Server Security Updates

The_Exchange_Team's avatar
The_Exchange_Team
Icon for Microsoft rankMicrosoft
Jul 13, 2021
Microsoft has released security updates for vulnerabilities found in: Exchange Server 2013 Exchange Server 2016 Exchange Server 2019 All versions (Cumulative Update levels) are impacted. ...
Updated Aug 05, 2021
Version 15.0
announcements
Exchange 2013
exchange 2016
exchange 2019
security
setup
NormC20's avatar
NormC20
Copper Contributor
Jul 13, 2021

Hi Nino,

I have a case open with support, I can email you the case number privately if you'd like.  We've experienced extreme Outlook slowness/poor connectivity since installing Exchange 2016 CU21.  Disabling AMSI has resolved the symptoms, but I'd love to see the problem resolved rather than disable an important feature.

I use Sophos, but I've seen mentions on forums of users with other AV products having the same issue.

 

First mention I found, sorry it's in German but easy to translate: Exchange 2016/2019: AMSI integration causes problems with Outlook - Frankys Web

Note that remarking out the AMSI lines in the web.config did not solve the problem for me, only disabling AMSI in the Sophos product.

 

There are a couple of mentions in this reddit thread: June Updates for Exchange 2016 and 2019 Released : exchangeserver (reddit.com)