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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
Go to Device Manger ( control Panel > Hardware and sound> device manager)
In device manager
expand network adapters (if its not expanded)
Right Click on your network adapter that the computer is using ( ie wireless or Ethernet)
Goto its properties (bottom choice when you right click)
Goto power tab with in properties and uncheck allow this device to turn off
Then in the advance tab
Disable the following- (there is a box when you highlight them that says enabled or disabled make sure these are disabled)
Energy Efficient Ethernet
Green Ethernet
power save mode
and any other "power saving" names (every manufacture may use a different term) in that list of settings
Click ok.
Sometimes these cards Lock themselves into that powersave mode and will not provide more bandwidth. Microsoft sees this and disconnects thinking your trying to save power or its a slow Ethernet. They literally make software to test connections for Microsoft 365 (https://connectivity.office.com/)
.. so if they make it clearly low bandwith or slow ethernet (due to power saving and not waking up) is an issue. You don't realize it because it the computer was on this whole time but it was slowing the nic behind your back. its like putting your phone in powersave... some apps wont alert you if they have it programmed to not work with low power.
Same for microsoft.
also you can try to NOT allow your pc to goto sleep and or hybernate... as well which could be causing the issue. our office has all of our stuff on full max power 247. However anytime we have an outlook issue.. THESE settings were to blame. What good is green Ethernet if the software doesn't like it.
I saw that, too. Optimizer seems to only be on Precision machines. They only have one. It made no difference.
I would love to if I actually knew.
It was literally 2 maybe 3 users in a tenancy of 40-50 mailboxes giving me grief.
Just seems to have calmed down.
In this other forum thread users said uninstalling Express Connect helped mitigate the issue:
Forum: How to fix outlook stuck on 'Trying to connect' - Microsoft Community
Dell support: Solved: ExpressConnect/Outlook Issue - Dell Community