Profile
I have copied the folders in the old Thunderbird profile to the new profile which was set up when I switched to a new SSD. The Local Folders all appear, but the contacts (address book) did not. The largest file (over 400,000 kb) is global-messages-db.sqlite. I have an abook.mab.bak file but no abook.mab file. Similarly I have a history.mab.bak file, but no history.mab file. These bak files are small. Trying to import an address book from the global-messages-db.sqlite in the Profile failed "unexpectedly". Help, please.
ప్రత్యుత్తరాలన్నీ (2)
You did not explain how you did the copy, as a straight copy would have included everything. If your thunderbird is current or fairly current, the addressbook is abook.sqlite, not abook.mab. Same for history.sqlite. If the old computer is still available, you can copy the files over with with Windows File Explorer, assuming you use windows.
I did the copy with File Explorer, and there are both abook.sqlite and history.sqlite in the new Profile. Thunderbird has read that profile to the extent of populating all the old folders and the emails saved in them, but it has not populated the address book.