I'm so sorry. I thought he mentioned he had several.
I have Personal Address Book (abook.mab) Collected Addresses (no idea
where they are stored, and the one I created (abook-1.mab).
So, just for kicks I created test1 (abook-2.mab), test2 (abook-3.mab),
and so on, until the last book was named I have no clue (abook-10.mab).
That gave me several. Deleting them also deletes the associated .mab
file. So if he has the one he lost saved in his backup profile, he could
try copying it, and pasting it in the current profile.
From the link you supplied.
"Recovering address books from a damaged profile
In the unfortunate event that your profile is damaged, it is possible to
recover your address books, even if the profile itself is unusable. Of
course you have made regular backups which you can simply import, but
just in case you hadn't... read on.
First, copy the damaged profile, or at least the ".mab" files, to a safe
place. Next, you will have to make a new profile, configure your
accounts and preferences, etc. Start Thunderbird and go to the address
book. Create some new address books ("File -> New -> Address Book").
Create as many address books as you had in the damaged profile, and give
them names like "AB1", "AB2", ...
Now exit Thunderbird, and go to the new profile folder. You will see
files with names like "abook-1.mab", "abook-2.mab", with small file
sizes, because they are empty. Copy the saved ".mab" files from the old,
damaged profile into the new profile. For each ".mab" file from the old
profile, there should be a file with the same name in the new profile.
If there isn't, rename the old file, giving it the name of a new file
which is not used yet.
Start Thunderbird again, and go to the address book. If all is well, the
newly created address books are filled with the contents of the old
ones. You can now change the names "AB1", "AB2", ... into something more
meaningful by right-clicking on each address book and choosing "Properties".
Of course, if your old address books have been damaged, this procedure
will not help.
"
Again, I apologize for my incorrect information. At least I taught
myself something new, that I didn't know before.