However, that does not let you choose a specific version. The workaround is to install version 38.5.0 and then upgrade. Starting with version 35.1.0 you can not install Thunderbird if you are using XP SP2 (rather than SP3) or are using a version of Vista that does not have the KB2763674 patch due to new signing. See this article if you want to go back to an old version of Firefox.īefore you do anything turn off the automatic Software Update feature in Tools -> Options -> Advanced -> Update. Any settings set by that file override the default values and whatever is set using the config editor and/or prefs.js. If its a frequent problem you could set them in the optional user.js file.

Those are the only two sets of settings that you need to worry about being reset due to the default value changing for a different version. If you try a really old version its possible you might have the same problems with the settings (mainly and ) to enable graphics acceleration. You will need to set it false again when you run the current version of Thunderbird. If you set extensions.strictCompatibility false using the config editor to let you install add-ons that don't explicitly state they support version 60 or later that value may get reset to its default value (true). Its also possible to keep the current version, and do a custom installation of a older version in a different directory to see if your problem is due to the latest version of Thunderbird or not.

Whatever version of Thunderbird you re-install, it will automatically find and reuse your profile (it contains your mail, address books, settings, saved passwords, add-ons etc.), which is not deleted when you uninstall or reinstall Thunderbird. This article describes how to go back to an old version of Thunderbird, including how to deal with problems that may occur due to changes to your profile.

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