Just a thought - were both versions of Thunderbird identical? Did you check the version numbers?

And, I understood that only files in the Profile folder should be copied, not the entirety of the Thunderbird folder.

But, there again, I'm a newbie here...

Arlev,

Thanks for your post and good idea. Both the current and new laptops are running 128.5.2esr. However, the current laptop has (Windows 10 and) the 32 bit version, and the new one has (Windows 11 and) the 64 bit version. These happened automatically---I didn't choose one or the other. Could that be a reason for my issue?

As for the copying, yes, I just copied the Profile folder as per the instructions I linked in my original post.

Andrew

I hope I didn't inadvertently mark my problem as "Solved" since I still need help!

Thanks

Arlev, As for the copying, yes, I just copied the Profile folder as per the instructions I linked in my original post.

As the cited SUMO article postulates you should have copied the entire Thunderbird folder - not only the profile folder - from the old computer and paste it - TB shut down - on the new PC in .... \AppData\Roaming\ ..here in place of the Thunderbird folder which has been created on the first TB run. If you transplant only the TB profile folder on the new PC, TB will not recognize this profile because the important file profiles.ini contains the path to and the name of the profile which has been created on first run and which you just replaced with the profile from the old PC.

Mapenzi,

Thanks for your reply. The SUMO article is a bit confusing because in the first part (source) it refers to copying the Thunderbird folder. But in the second part (destination) it refers to having copied the Thunderbird profile folder.

In any event, I must've done something wrong since my local folders, address book, etc., aren't showing up on my new computer.

So, I want to give it another go. From your post it sounds like before I paste the TB folder into Roaming on the new computer, I should delete the current TB folder there. Do I have that right?

Thanks again for your help.

I'm assuming same version number has been installed on each computer.

Check the Firewall on computer B (W11) - has the Thunderbird program set up as allowed. Note: Firewall may be the default that comes with computer or may be controlled by an Anti-Virus product you installed.

On computer A (W10)

• Exit Thunderbird
• Access Profile via the following method:
• In windows search type: %Appdata% - see image as guide
• Select %Appdata% file folder
• Click on 'Roaming'
• Copy the 'Thunderbird' folder to an external drive

On computer B (W11)

• Exit Thunderbird
• Access Profile via the following method:
• In windows search type: %Appdata% - see image as guide
• Select %Appdata% file folder
• Click on 'Roaming'
• Delete the 'Thunderbird' folder - it got created by default.
• On external drive - Copy the 'Thunderbird' folder which came from the W10 computer.
• Paste the copied 'Thunderbird' folder into the 'Roaming' Folder.

start Thunderbird.

Toad-Hall,

Thanks for your detailed post. Yes, both the current and new laptops are running Thunderbird 128.5.2esr. The old laptop (W10) is 32 bit and the new laptop (W11) is 64 bit---I'm assuming that won't be a problem?

I will give this another try and report back.

Thanks everyone for the help.

Andrew

Mapenzi, Thanks for your reply. The SUMO article is a bit confusing because in the first part (source) it refers to copying the Thunderbird folder. But in the second part (destination) it refers to having copied the Thunderbird profile folder.

You are right, parts of this article are confusing and several user in Mozilla forums have been misled, in particular by the line "From your Thunderbird profile folder in Finder, open the Go menu and select Enclosing Folder two times." It means: from the profile folder navigate two levels higher and you will have selected the "Thunderbird" folder (which you should copy from the old PC to the new PC and paste in ...\AppData\Roaming\)

Thanks, Mapenzi.

Andrew

New wrinkle: I'm in the process of copying the TB folder on my old laptop. About 62% of the way through, I got a message: "Are you sure you want to copy this file without all its properties?" It's described as a "WDSEML File".

I didn't see much choice, so I clicked "Yes". Quite a few more of these messages continued to appear and I ultimately clicked "Yes to all" or the equivalent. Again, other than aborting the operation, I didn't see much choice.

Any idea what this means?

Thanks again.

Any idea what this means?

• .mozmsgs folders and *.wdseml files are generated by the Windows search. Normally you shouldn't see them in the Thunderbird profile folder.

In my experience they are stored in the profile when certain message storages are externalized from the profile folder. You can delete them without danger since they contain no messages; just some infos like .msf files.

Thanks once again, Mapenzi. Very helpful.