I have been having problems with portability of Thunderbird 60.0 (Portable edition 2.1.2.0 from 8/6/2018) installed on a USB2.0 stick between Windows 7 and Windows 10 and Lightning Calendar not always available.
Initial search for this problem led me to 'Calendar update Issues with Thunderbird' at https://support.mozilla.org/en-US/kb/calendar-updates-issues-thunderbird
In Windows 7, using procedures outlined from the above link in 'Lightning disappears after a Thunderbird update (release and beta versions)' following Options-Advanced-Config Editor...-extensions.installedDistroAddon{. . . was reset, it successfully restored the calendar.
When I use the same USB Stick in Windows 10, the calendar is not visible but Lightening is available with no calendar feature, and the procedure outlined above to restore the calendar is not valid as the extensions.installedDistroAddon is not longer listed to reset.
N.B.
Note that I only use Thunderbird for the calendar/Task features.
The Lightning addon has been set to manually update and my default is to work offline.
I do not have Thunderbird installed on either Win7/10 machines.
The portableapps program is not installed - only thunderbirdportable is installed on a USB stick.
Question: How can I get Lightning (and Calendar) to display when ThuderbirdPortable starts on either a Windows 7 and 10 machine from the same USB Stick?