I run Thunderbird Portable on an portable external hard disk. I've used it w my XP computer w/o problems. I just tried it w my new Acer 5750Z-4835 computer running Windows 7 and it says:
"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."
When I check the processes using Task Manager I don't see any Thunderbird process running.
Thanks for any leads!
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I had the same problem a few weeks ago. Fixed it by changing the permissions on the NTFS formatted portable hard drive. Why the error message about another process running is beyond me.
Clair