Then, go to ‘Help’ à Troubleshooting Information. If you cannot see the ‘Tools’ at the top menu bar, press ‘Alt’ in your keyboard to see the menu bar. You can also open it directly from Thunderbird. Open your Profile Folder in computer, if you know where it is.Here’s a step-by-step tutorial on how to do this:

Then, create a new profile manually and set the location for this profile the same as the old one you want to load. In Short: Delete your Profiles.ini file (or keep it somewhere else as a backup), forcing Thunderbird to create a new Profiles.ini file.

Here’s a very simple way to get back your old profile with its old content back into Thunderbird. Integrate Old Thunderbird Profiles in Thunderbirdīut do not worry. For example, if you make any changes in the profiles.ini file and there were some errors, Thunderbird will fail to load your old profile. It can also happen if you make some changes manually by going into your Profile folder. Many times, after a major update, Thunderbird won’t load your old profile, especially if your old Profile folder is very old with different settings and database files than what new update supports.

Old thunderbird