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Starting a few months ago some of our users are reporting that Outlook and Teams disconnect multiple times throughout the day. The only way to fix it is to reboot the machine. They are using Outook for 365 and connecting to a mailbox in Exchange Online. It started with 2 users but more have reported the issue recently.
During the time Outlook & Teams disconnect they do not loose network or internet connection and can open Outlook and Teams on the web.
So far I have tried:
I have listed below the version of Outlook and Window 10 they are using.
Microsoft® Outlook® for Microsoft 365 MSO (Version 2205 Build 16.0.15225.20348) 64-bit
Windows 10
OS build: 19044.1766
Using Classic Outlook on Windows for personal email, calendar, and contact management
Locked Question. This question was migrated from the Microsoft Support Community. You can vote on whether it's helpful, but you can't add comments or replies or follow the question.
Have any of you tried uninstalling Dell Optimizer? Apparently that has worked for some folks in the very recent past. It has not worked for my issue, but ours may be a bad network (our only users having the issue are in one small office). Something to do with it installing ExpressConnect
There hasn't been anything useful on this topic from Microsoft in years. I've seen posts about this issue dating back to 2018. I'm only commenting to try to save you a little time. This issue is not isolated to windows 11. I'm still in windows 10 and having the same issue since I have been using outlook.
Ok I understand. Thanks.
This problem is very strange. We have several hundred clients but only around 5-8 users have this problem, that I know of.
Most of them are newly hired, new PCs and Windows 11.
So it ain't old bad configuration.
Going back to Windows 10 seems to worked for us but time will tell.
It's a very odd issue. We a large number of computers as well, but around the same number having the issue. Our are all recently added computers to the domain with all except one computer being Windows 10. I removed the Dell Optimizer off of two computers as suggested above to see if that changes anything.
We have a case open with Microsoft, yet, still no solutions.
Users are all on Dell laptops, Windows 10 and 11. Azure environment with Intune.
Same problem here. Windows 11. We have hundreds of Windows 10 machines with no issue, but 50% of the test machines on Windows 11 have this problem.
Teams can be 'fixed' by running the Windows compatibility troubleshooter. End result is that it sets Teams to run in compatibility mode for Windows 8 and then Teams will function normally.
Have not been able to similarly fix Outlook. Every hour or two Outlook will go to "Trying to connect" and no longer be able to send or receive data. Rebooting the PC will temporarily resolve the issue. Reinstalling Office, repairing Office, and even reinstalling/reimaging the PC with a fresh Windows 11 load does not fix the problem.
The Microsoft Support and Recovery Assistant (SaRA) also does not resolve the issue after allowing it to clear saved credentials, recreate Outlook profile, etc. Nothing works except restarting the PC.
Hello Jamie Penistone
Good day! Thank you for posting to Microsoft Community. We are happy to help you.
Regarding your post, as many users facing this query, so suggest you to check with one of the affected users to check with scan Outlook with SARA tool by follow the steps mention in Scan by using Microsoft Support and Recovery Assistant - Outlook | Microsoft Docs. The Microsoft Support and Recovery Assistant (SaRA) uses advanced diagnostics to report known problems and details about your Microsoft Outlook configuration. Additional choose Outlook from SARA tool and select Outlook keeps saying "Trying to connect..." or "Disconnected" option and check the result. To learn about SARA tool, kinldy check details from About the Microsoft Support and Recovery Assistant.
For testing purpose, ask one of the affected user to configure his Outlook in different system with different network (not belongs to your organization’s system) and check if it makes any difference.
Further during search, found one of the know issue with connectivity, so kinldy check details from Internet connectivity issues in M365 apps after a change to the IP address range (microsoft.com) to see if it match with your situation.
Thank you so much for your precious time and cooperation. Stay safe and healthy.
Sincerely,
Ankita Vaidya | Microsoft Community Moderator