(win32): I've installed Thunderbird 1.5 on my machine, but as soon as I try to start it I get this errormessage:
And when I start the Profile Manager, I get:Thunderbird is already running, but is not responding. To open a new window, you must first close the existing Thunderbird process, or restart your system.
Thunderbird cannot use the profile "XXX" because it is in use.
To continue, close the running instance of Thunderbird or choose a different profile.
[SOLUTION]
It seems that there were some leftovers from previous installations - I should have known this already when I saw a "non-default" profile name in the Profile Manager.
I've simply created a new profile, deleted the old one - AND its files (usually somewhere in "Documents & Settings\username\...." ).