Second Instance of Thunderbird which update the default installation and a second installation in one update from the App Menu
Hello Community,
Some years ago I saw a solution to install a second Thunderbird-Instance
in a seperate folder (I do not mean the solution as a subfolder as described
here: https://portableapps.com/support/thunderbird_portable#local_profile
and the third topic "Using a Second (or Third) Profile with Thunderbird Portable"
cause this is an installation in a subfolder of ThundrbirdPortable.