I installed dualboot Linux Mint Mate15 and WindowsXP and am establishing Thunderbird as successor of Outlook.
After installing the Windows Thunderbird version I already managed to import my Outlook mails (Outlook.pst and archive.pst) in Thunderbird and backed up on an external disk the Profile of that Windows Thunderbird containing all my previous mails and settings and want now to import that Profile into the Linux Thunderbird.
I read somewhere I should do that with the Profile Manager and not just paste that Profile content in the Linux Thunderbird version.
When I tried, however, to use Profile Manager and clicked "Create" it made a Profile with its unique code, but empty. I missed a possibility to import my previous mail from the Windows Thunderbird Profile I backed up on my external disk.
If I use the Browse button it seems to me that will be the destination location for that new and empty Profile.
=> How do I get the content of the Profile backup from the Windows Thunderbird version in my Linux Thunderbird?
Just copy-paste all content of the Profile om my external disk to the newly created Profile in home/henk/.thunderbird/? And juste paste it and add it or over write it?

Would be interesting to know where you read that you shouldn't copy paste, and why. I have done this dozens of times and never had issues. What I typically do is copy the profile directory and add an entry to the profiles.ini file to point to the new directory. That way you don't have to remove the old directory. Feels better to keep it around just in case :-)
This even works between thunderbird and icedove. It does sometimes break add-ons when you are doing this between different thunderbird versions, but other than that you should be ok.

Solved: See my post "How to access Profile Manager of Thunderbird"