Comment Re:Broken (Score 5, Informative) 311
I had the same error message. Do you have a Logitech Quickcam? I found that the Quickcam software which runs in the background on start-up was keeping a lock on the mozMapi32.dll file in the Thunderbird program folder. I had to use process explorer to kill off QuickCam10.exe before I could complete the installation.
