Try again later
   Check your network connection
   Check that Firefox has permission to access the web (you might be connected but behind a firewall)"

After running Thunderbird update, while attempting to upgrade my version (138) to version 141, the following is what I received and just keep on receiving: "Hmm. We’re having trouble finding that site. We can’t connect to the server at learn.microsoft.com. If you entered the right address, you can: Try again later Check your network connection Check that Firefox has permission to access the web (you might be connected but behind a firewall)" Earlier last week, after repeatedly receiving the above error, I tried installing two of my email accounts, on my laptop, where I usually keep one email account. Those two accounts were created without a single hitch, after feeding in my credentials, so apparently Thunderbird does in fact have my profile and settings on it's servers."" Currently, I have all four of my email accounts set up, after the last three-(3) were created on this PC Thunderbird repeatedly sends the above error notices to. I've read all there is to read and have tried every suggestion that your self help support literature has suggested, including troubleshooting Thunderbird's connectivity, my site's antivirus-malware setup, its browser settings, my DNS / router settings, and the Proxy settings for my windows firewall, as well as my fire fox browser settings and nothing seems to solve the problem. Oh, and finally, when I first tried to create my email account, I received a notice after a couple attempts concerning my certificates and their not being installed for my end to end encryption. The noticed warned, that my email servers would not connect until my certificates were regenerated and configured for each email account. so, I took care of it (installing and configuring my certificates) and Thunderbird responded by not turning green for go, so I'm beginning to wonder what's going on here? Please send me any further suggestions that might help, because I'm convinced that the problem that started with your installer now continues to persist after that first failed installation (I've read about it on your forum) screwed up all my legit settings and managed to lose all my profile settings! Anything in the way of getting things straightened out would be greatly appreciated! Signed, Lendell Alston A longtime Thunderbird and now growing urgently concerned user!