Hi David,

There are people on the forum who can help more than I can with profile issues, but I feel for you and this kind of problem annoys me, so I'll share my ideas.

1. I don't know how Windows upgrades are done these days. Did the upgrade erase your old profile? Is there some way to access it as it was before the upgrade? Do you have a back-up? Copying mbox files from your old profile or from a back-up should be a reliable way of getting them into your new profile.

2. Your files look fine to me. You seem to have an mbox file and an index file for each local folder, as you should. I just did a little test to try to duplicate your situation. I was surprised that a test transfer of files into my profile showed only a few messages until I repaired the folder because I have moved many mbox files into my profiles in the past without any problems that I can recall. Have you tried repairing one of your local folders? Right click on the folder, select properties from the drop-down menu, then click on "Repair Folder". Results?

3. If that doesn't work, I would move one pair of mbox file and index file, e.g., "Attic" and "Attic.msf", outside your profile and import the mbox file, letting Thunderbird create a new index file. Steps: close Thunderbird, move those two files outside your profile to a convenient location, open Thunderbird, install the ImportExportTools NG add-on, right click on "Local Folders" in Thunderbird, select "ImportExportTools NG", then "Import mbox Files", then "Individual mbox Files", then "Attic". What happens?

Even if these steps are not successful, they may help someone diagnose the problem better and then solve it.

Rick

Many thanks Rick, and I appreciate you taking the time to share your suggestions.

My upgrade was done in a shop, as I had to have a new motherboard / CPU to upgrade (my pc was built in 2018 and sadly didn't meet the Windows 11 requirements) - and there was no extra back-up taken from Thunderbird apart from the 'export' profile I took last thing before the work was done. Sadly the export file appears to be corrupted.

I tried using the Repair Folder option but nothing happens at all.

I tried using the ImportExportTools NG add-on but had no joys there either...have tried pretty much all import options (see image) but it only seemed to recognise folder names (Inbox, David's Archive, etc) but imported no emails...it's as if the import doesn't recognise the file names...the export files which are copied to my profile don't have EML extensions they simply say File and MSF File, although that is true of all the email folders under my profile, but all I know is that the add-on tool doesn't seem to recognise there are emails there to import so just shows Import Done 0 messages found.

I am at a loss - and for now I can't think what else I can do...the files all seem to be there but the import tools don't recognise them for some reason.

Did you try "Import mbox Files"? Your files are mbox, not eml.

This idea is now heading toward wild guess territory ... I wonder what would happen if you added the "mbox" extension to one of those files without an extension. ImportExportTools NG should recognize it as an mbox file or folder then.

Had tried MBOX with no joy, but have done some more experimenting...

I tried renaming copies of the files as both .eml and .mbox (see image) but nothing is working...the add-on goes through the import process, noting that it is ignoring any files that are not MBOX or EML, but then completes with 0 messages found. It just doesn't recognise them (or at least cannot work out that they contain emails).

Thanks for the suggestion.

Shoot. I'm sorry that I cannot help more.

Thank you for trying to help though, not had any other suggestions. I tried importing the Local Folders into another email client (EM Client) but what came across made no sense, so I am still unsure if the files I am trying to get Thunderbird to recognise are actually okay or unusable.