I'm trying to migrate my Thunderbird (T/B) profile to a new HDD running WIN10 Pro.
I'm coming from a WIN7 Pro HDD.
Both T/B programs are the same releases (newest).
The old T/B account was working perfectly when I copied the profile.
I have followed the T/B Help notes EXACTLY (7 times, actually).
The new T/B will not respond and accept the profile.
My profile contains ~ 3 years of saved emails, receipts, etc., that I really can't afford to lose.
ANY help or ideas would be appreciated.