I've been using Outlook Express (from XP) for years, even into the Windows 10 era with a patched version of XP. Since GMail will no longer support it after May 2022 I decided to migrate to Thunderbird '''Portable'''. Since 91.8.1 doesn't import from Outlook Express, I first used Thunderbird '''Portable''' 52.9.1 x86 (last version that supports XP) to import mails, accounts and whatever else it imports. I then set up a Primary Password, and painstakingly manually added all rules from Outlook Express to Thunderbird's "filters". After everything was up and running, I upgraded to Thunderbird '''Portable''' 91.8.1 x86. For some reason, when I try to login to any GMail account, after the login, pass, allow Thunderbird as email client, a popup window appears asking me to "Change Password", but whatever password I put, it always says "Unable to change password". If I go to "Privacy & Security", "Use a Primary Password" is disabled, and if I check it, it asks me to enter and re-enter a new password, but it also says "Unable to change Primary Password". II tried both commands listed in the link below, both seem to work by pressing the Reset button, but the error console seems to output a uncaught exception. https://support.mozilla.org/en-US/kb/protect-your-thunderbird-passwords-master-password#w_resetting-your-master-password-if-you-have-forgotten-it Any more suggestions?