I just bought a new HP computer and migrated Thunderbird to it. Both my old and new computers are Windows 10-64. I watched the video instructions (several times) on how to migrate my profile to the new computer and even though it took a few tries I finally got it right and Thunderbird opened with all my settings, previous emails, and address books. (But the process is seriously convoluted... can't there be a simpler way?) This morning I booted up and Thunderbird opened just fine, but it would not give me my AT&T emails. Instead, it game me this error message: "Sending of password for user [email protected] did not succeed. Mail server inbound.att.net responded: Server error - Please try again later." I also have a Gmail address and Thunderbird had no trouble getting those. It was just AT&T. So I went to the AT&T mail support page and was told that since I have a new computer I need to change my passwords, starting with the primary account and then for each email account individually. Since all of my AT&T mail accounts use the same password I tried to change them, but the account wouldn't let me... even though I had already changed the primary password, AT&T said it didn't "recognize" the new one so I wasn't allowed to change them. So I went back to Thunderbird and tried to find what passwords it was using to get into each account, but when I went to each account settings window I could not find a password listed. And that's where I sit now, unable to get into my AT&T accounts. Does anybody have an idea of how to fix this mess without losing all of the settings, previous emails, and address books?