I'm a first-time Ubuntu user - I've just put 13.10 on my XP system as a dual boot.
I used Thunderbird portable on the XP machine (easy to recover every time you need a rebuild!), and I understand that you can use the same profile on Ubuntu - sharing the profile location by indicating its location in the profiles.ini file. So I did this using -profilemanager, and it worked nicely. I could access exactly the same data on Ubuntu as I could on Windows.
However, after I turned off and rebooted, I got this message when I started Thunderbird:
'Thunderbird profile cannot be loaded - it may be missing or inaccessible'
I looked at the profile.ini file with a text editor - it hadn't changed and was still pointing to the right directory. If I deleted it with -profilemanager and re-installed, it worked fine for that session. I could drop Thunderbird and start it again - no trouble. But if I re-booted, I lost the profile and had to re-establish it - although the profile.ini file hadn't changed.
I wonder if this is some kind of privileges issue? Whatever it is, I can't think of any more things to try. Has someone out there got any ideas?