I just migrated my profile to a new computer. Here's the (mis)steps I took: 1. Copied my old profile from .../appdata/local/... (I since figured out it would have been better to copy from roaming). 2. Installed TBird, which created a new default profile. 3. Copied the folders inside the old profile folder to the new one (roaming this time per instructions). 4. Started up TBird. The old mail all seemed to be there. 5. Checked my mail. None of the passwords were saved. Now I can check and send mail, but must manually enter my passwords the first time each session. If I check "Use Password Manager to remember this password" while checking for messages, the program fails silently (bad design, IMHO, as this behavior suggests to users that ). If I do this while sending, I get this error message: Sending of the message failed. An error occurred while sending mail: Could not get password for mail.example.com. The message was not sent. Digging into TBird's options shows that no passwords are saved. I am suspecting a permissions problem which prevents writing to some file, or a profile file that is missing or corrupted. I did change my username on the new machine, FYI. Anyone with a solution?