I followed your instructions to the letter and it worked perfectly.
i called the new profile XP EMAILS and it appeared on the Profile Manager like magic.
When I selected it and opened Thunderbird, my entire XP mailing list was there,
the old Thunderbird mails and the imported OE mails.
JOB DONE !! To successfully complete my XP salvage of data. No more left now, all transferred over to Win 10.
Thank you a million for your detailed help, without it I would never have done the Thunderbird job.
Most grateful to you and I wish you a Very Happy New Year.
The new Win 10 Thunderbird XP profile format is as the image below, exactly the mirror image of my old XP Thunderbird.
My desktop shortcut to the profile manager makes it a doddle to switch.
Thread is - PROBLEM SOLVED.