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Migrating from a Windows 10 computer to a Windows 11 computer and many aspects are not working correctly

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I'm migrating Thunderbird from my old Windows 10 computer to a new Windows 11 computer.

I've installed Thunderbird v115.12.2 and successfully moved all my accounts, emails, calendars, etc., to the new computer.

Several things are NOT working correctly, though:

1 - Settings will not open. Here is the message from the error console:

Error: No such tab mode: preferencesTab

   openTab chrome://messenger/content/tabmail.js:758
   openTab chrome://communicator/content/utilityOverlay.js:257
   openPreferencesTab chrome://communicator/content/utilityOverlay.js:295
   openOptionsDialog chrome://messenger/content/mailCore.js:628
   oncommand chrome://messenger/content/messenger.xhtml:1

tabmail.js:956:17

   openTab chrome://messenger/content/tabmail.js:956
   openTab chrome://communicator/content/utilityOverlay.js:257
   openPreferencesTab chrome://communicator/content/utilityOverlay.js:295
   openOptionsDialog chrome://messenger/content/mailCore.js:628
   oncommand chrome://messenger/content/messenger.xhtml:1

2 - Customize menu does not open

3 - The hamburger menu in the upper right corner does not open

4 - The spaces toolbar on the far left is missing

5 - Events and Tasks are missing from the menu

6 - My calendar is nowhere to be found - I can't find a way to access it (on my old computer, I clicked on the calendar icon in the spaces toolbar on the left side of the window)

Thunderbird on my old computer was also running v115.12.2 when I backed up the profile folder to move it.

I tried downgrading to Thunderbird v102. I had all of the same issues listed above PLUS all my accounts and emails disappeared. -- I've brought it back up to v115.12.2.

Could someone please help me get Thunderbird working correctly?

I'm migrating Thunderbird from my old Windows 10 computer to a new Windows 11 computer. I've installed Thunderbird v115.12.2 and successfully moved all my accounts, emails, calendars, etc., to the new computer. '''Several things are NOT working correctly, though:''' '''1 - Settings will not open. Here is the message from the error console:''' Error: No such tab mode: preferencesTab openTab chrome://messenger/content/tabmail.js:758 openTab chrome://communicator/content/utilityOverlay.js:257 openPreferencesTab chrome://communicator/content/utilityOverlay.js:295 openOptionsDialog chrome://messenger/content/mailCore.js:628 oncommand chrome://messenger/content/messenger.xhtml:1 tabmail.js:956:17 openTab chrome://messenger/content/tabmail.js:956 openTab chrome://communicator/content/utilityOverlay.js:257 openPreferencesTab chrome://communicator/content/utilityOverlay.js:295 openOptionsDialog chrome://messenger/content/mailCore.js:628 oncommand chrome://messenger/content/messenger.xhtml:1 '''2 - Customize menu does not open''' '''3 - The hamburger menu in the upper right corner does not open''' '''4 - The spaces toolbar on the far left is missing''' '''5 - Events and Tasks are missing from the menu''' '''6 - My calendar is nowhere to be found''' - I can't find a way to access it (on my old computer, I clicked on the calendar icon in the spaces toolbar on the left side of the window) Thunderbird on my old computer was also running v115.12.2 when I backed up the profile folder to move it. I tried downgrading to Thunderbird v102. I had all of the same issues listed above PLUS all my accounts and emails disappeared. -- I've brought it back up to v115.12.2. Could someone please help me get Thunderbird working correctly?

All Replies (5)

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A bit off the wall, but where did you download your Thunderbird from? I have some bad feelings about the version offered in the Microsoft store. Mostly because it works in some sort of sandbox that is not explained anywhere clearly.

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I downloaded it from Thunderbird.net site.

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Weird. (my one word synopsis)

Did any of those things work before the profile migration? Where was your profile on the old machine Vs new? I would expect some variance in the user name in the appdata path, but is it on the same drive letter?

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Everything worked (and still works) perfectly on the old computer (Windows 10).

Everything is identical on file location - c: drive - under identical computer "user" name.

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SOLVED! -- For anyone else running into these types of issues on Windows 11, there is a simple solution. It took me a month to figure it out, but here it is: Install it as "administrator." Right-click on the .exe installer, choose "Run as Admin," and let it run through the installation. Once I did this everything runs perfectly on it now 😁

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