Thunderbird Portable as Default Mail Client (Integration)
Here is the best and easy solution to make ThunderbirdPortable as Default Mail Client...
1. Create a subfolder in your ThunderbirdPortable folder (for example: "..\ThunderbirdPortable\Windows")
2. Change to the created subfolder to create the following batch-file...
3. Create a batch-file (for example: "Thunderbird Portable Integration.bat") with the following content :