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Hi, I'm having the exact same issue.
We are having issues with Outlook 2016 and M365 Outlook and On-prem Exchange 2016 Enterprise
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George Teeter
1
Reputation point
The update released 10/11/2022 is breaking the connection between Outlook and On-prem Exchange
Clients
Windows 10 and Windows 11
Outlook M365 Business and On-prem Outlook 2016
Server
Servers OS 2016 Standard
Exchange Enterprise 2016
Once (KB5018418) is installed in windows 11 M365 Outlook version 2209 15629.20208 or 2209 15629.20156 would report "Disconnected" from the exchange server.
Other workstations with windows 10 (KB5018410) and M365 Outlook or Office 2016 also reported the issue.
Once this update was removed and the system restarted the problem went away.
Restarting the clients without removing the applicable update produced no changes and Outlook would still show "Disconnected"
Outlook | Windows | Classic Outlook for Windows | For business
Exchange | Exchange Server | Management
7,925 questions
Windows for business | Windows Server | User experience | Other
20,219 questions
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LilyLi2-MSFT 1,981 Reputation points2022-10-14T07:06:05.877+00:00 Hi @George Teeter ,
Welcome to our forum!
Thank you for troubleshooting and temporarily finding a workaround.
As you said, remove the update and outlook can connect to Exchange without problems.
This seems to be related to Windows KB, so I will add a Windows tag for you.And since this KB was recently released, we have not received any other similar feedback yet. However, if there is an update from the Exchange in the future, we will reply to you in a timely manner.
Besides, in the following link, there are some related discussions about the KB released 10/11/2022, you could refer to: patch_tuesday_megathread_20221011
Thank you for your understanding and support!
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Igor Murashov 1 Reputation point2022-10-17T12:55:33.533+00:00 Hello,
Got the same problem.Outlook 2016-2019
Exchange 2010
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Predrag Matic 6 Reputation points2022-10-20T05:43:27.537+00:00 I'm having the exact same issue.
On prem Exchange 2016, and Outlook 365.
I've had to uninstall the KB5018418 on the Windows clients in order for the clients to connect. Not ideal, but only thing I can do at this stage for them to connect.Hoping a solution is provided.
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