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Lolu chungechunge lwabekwa kunqolobane. Uyacelwa ubuze umbuzo omusha uma udinga usizo.

Moving back to previous version of Thunderbird

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  • Igcine ukuphendulwa ngu Toad-Hall

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Thunderbird update itself to 78.5.1. Honestly, the U.I. is way worse than the previous version. There are also some problems with the subject display pane on Windows 7. I want to uninstall the update and go back.

Where do I find the earlier versions? And after downloading and installing, will all my contacts and saved emails still be there?

Thunderbird update itself to 78.5.1. Honestly, the U.I. is way worse than the previous version. There are also some problems with the subject display pane on Windows 7. I want to uninstall the update and go back. Where do I find the earlier versions? And after downloading and installing, will all my contacts and saved emails still be there?

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you may see various options for regain old data shown here : (option-1) downgrade (option-2) second-TB (option-3) transfer data from profile.

you may also see how to disable AV/FW/SS, based on what info/instruction shown here (PART-3 & PART-4).

downgrade optioin will show you download link & also has related info. yes, all of your older+new profile (including all previous emails & contacts) are here: "%APPDATA%\Thunderbird\Profiles\" <- you MUST make a backup copy of this folder in your Desktop or where you want . then you may follow various steps or what you want to do . in Windows-Explorer make sure to Show hidden files , Show file extensions . and try to run "Explorer" as a privileged (admin type of user) user , so it can copy ALL files.

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There is a particular set method to being able to go back to a previous version .. The following instructions apply providing you are going back to an earlier version of 78*. Additional proceedures would be necessary if going back to version 68* - so read carefully.

In the 78.5.1 version:

  • Menu app icon > Options > General
  • Scroll down to 'Updates' section
  • select 'check for updates, but let me choose whether to install them'


If needing to go back to a 68* version then fix the address books: But if going back to an earlier 78* version then this section is not necessary. In Thunderbird

  • Help >Troubleshooting Information.

Under Application Basics section about 8 down in list see 'Profile Folder'.

  • Click on 'Open Folder'

A new window opens showing the contents of your profile name folder.

  • Exit Thunderbird


In the profile name folder - you will find the old address book files with extension .mab.bak - those files (abook and history) you need to:

  • -rename them to .mab (so remove the .bak part) eg: 'abook.mab.bak' becomes 'abook.mab'
  • -rename abook.sqlite and history.sqlite by adding .bak to the name. eg: abook.sqlite.bak
  • Do same for any other address books you created.

End of section for sorting out address books if going back to version 68*


Now uninstall Thunderbird program. You could just delete the Mozilla Thunderbird folder from here:

  • C:\ Program Files (x86)\Mozilla Thunderbird
  • then empty the computer 'Recycle Bin'

Then get download from here: This is for version 68.12.1

This is for version 78.5.0

Run the downloaded .exe file to install. On the last step of the installation do NOT select to start TB because you will need to run a command to allow you to downgrade.

Windows OS:

  • In search type : Run
  • Select the 'Run' app
  • Type: thunderbird.exe -P --allow-downgrade

note there is a space before and after -P

  • click on OK

Profile Manager starts select the desired profile name click on 'Start Thunderbird'.