If you receive an error stating MozMAPI32.dll cannot be written to while installing or upgrading Thunderbird, do you use Logitech products? Check the background processes for QuickCam.exe. Kill that process and installation should complete.
If you receive an error stating MozMAPI32.dll cannot be written to while installing or upgrading Thunderbird, do you use Logitech products? Check the background processes for QuickCam.exe. Kill that process and installation should complete.