Quote:
Originally Posted by ownedbycats
Due to Microsoft changing... something, I had to remove and re-add both of my Outlook.com accounts to Thunderbird to stop getting multiple 'login failed' errors whenever trying to do anything.
It killed all of my filters.
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I ran into the same thing but switching to using an app password with Thunderbird fixed the issue. I have the feeling this was due to one of recent security updates requiring 2FA.