I wonder if there was an update and thunderbird may have created a new profile. Just a guess, but you can check:

1. click help>troubleshootinginformation
2. scroll down to 'profiles' and click 'about:profiles
3. the next screen is a list of profiles. Click to open one that is not active
4. now, click the Mail folder and then the Local Folders folder to see if any message folders are there. If so, you found the missing items. Let me know and we can proceed from there.

Dear David,

Thank you very much for your quick reply.

The last Thunderbird update was on Dec 11, 2025. This update was not the cause of losing my local folders, as they were deleted on Jan 7. I likely experienced an unwanted Windows update on Jan 7, which slowed down my computer and made me restart it.

I am attaching screenshots that may help clarify my problem. It is confusing to me that, in the meantime, I have added new folders to my Local Folders directory, but the Profile/Mail appears unchanged.

Kind regards, Jasmina

There seems to be a discrepancy. Would you please do another screenshot of Local Folders that includes the path all the way from C prompt. The one shown just says Mail\Local Folders. If those other folders are there, my assumption is that we're not seeing the right Local Folders. That doesn't resolve the issue, of course. Did you check other profiles, per my earlier suggestion? What did you find?

One more question: two of your screenshots show the profile folder. One has just the trash in local folders, and the other has several folders there. What do the two represent? It seems to be two separate profiles.

Dear David,

I am attaching a screenshot of my Profile from the C path. I have only one Profile. The difference you see in my new Local Folders is what I have added in the last two days since I've lost the old ones. They are marked with #2.

Thank you very much for helping me with this.

Kind regards, Jasmina

If you have added new local folders, yet a screenshot of Mail\Local Folders is now showing them, then we are not seeing the right folders. Thunderbird cannot have folders that are hidden from Windows. You are stating that if you go to appdata\roaming\thunderbird\profiles that there is only one profile. And the profile does not show the Local Folders that are displayed in Thunderbird. It just doesn't add up to me. Maybe someone else will see the discrepancy.