These two attachments, which I sent yesterday afternoon show the contents of"fcw...". It does not have a Mail folder, but does had Prefs. When I used Mozbackup it automatically displayed those three folders, 1me, fcw and nn. I tried 1me first and found it was corrupted. I then chose fcw and it did indeed back up all my mail, and this included Archives going up to 2024. Whilst the size of this backup file is 3.6 gig, slightly smaller than I had said these files only exist on Drive D:, there are no emails in Tbird on C:. This folder is only 221 mb in size. I cannot explain but to propose that fcw links on to Drive D:. This backup took two and a half hours! As I mentioned "nn..." went through the process of backing up but stopped after only a few seconds and with nothing at all saved. I an struggling a little here but it does seem to work. I have to call it day a day now, but will look through your comments to see if I can understand it better. I am presuming you may also be leaving soon, but please comment.

Just a quick update. Attached Properties of fcw. No additional data has been added to any of those tree folders. nn is 207 mb. Take your advice about Mozbackup. Never had a problem, but never restored from it! Will take your guidance.