Office 365, Email, Exchange, Thunderbird errors when clicking on folders

I get an error every single time I click on a folder, how do I fix it?


Thunderbird is a free, open-source product and there isn't a vendor for us to escalate to. We will try to help troubleshoot but in the end you might need to visit forums for solutions. 

If you run into trouble and are faculty/staff you should speak with your local IT pro about using officially supported email clients.

To disable the error you are seeing you will need to get to the General Tab:


In Thunderbird : Display the Thunderbird Menu > Options >  General tab 

Thunderbird > Preferences > Advanced > General tab

1) Once there, click on Config Editor...
Click on I'll be careful, I promise!
2) In the search box type: send_client
Look for this line: mail.server.default.send_client_info; Value = true
4) Double click on that line to toggle TRUE to FALSE
Close windows
6) Restart Thunderbird

Keywords:2013, command error 12   Doc ID:57287
Owner:Office 3.Group:University of Illinois Technology Services
Created:2015-10-13 11:25 CDTUpdated:2021-04-29 15:55 CDT
Sites:University of Illinois Technology Services
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