There is a bug in the PortableApps.(sorry for bad english...)
The full path to the Calendar-App is stored in "addonStartup.json.lz4" File within the driveletter.
This file will not be changned by the launcher.
So you move from one Computer to the next and the driverletter changes Thunderbird-portable
would not find the App. So there is no Calendar etc. I have try to fix it but now luck (dont know where I can
put in the "search and change" for this file.
You are here
[Fixed] Thunderbird Lightning file addonStartup.json.lz4 paths not modified