Copying an old profile folder into recent versions of Thunderbird

For information

I did not realise that things have changed with Thunderbird recently with regard to profile folders.

I wanted to install my old profile folder, mwva5kez.default, onto Thunderbird in a new computer.

After starting and then closing Thunderbird, I was presented with this profiles.ini file in .thunderbird (View > Show hidden files in Home folder):

Code:[Profile1]
Name=default
IsRelative=1
Path=y2uh087c.default
Default=1

[InstallFDC34C9F024745EB]
Default=w6rcgsdu.default-release
Locked=1

[Profile0]
Name=default-release
IsRelative=1
Path=w6rcgsdu.default-release

[General]
StartWithLastProfile=1
Version=2I deleted the italicised Profile1 and replaced w6rcgsdu.default-release with
mwva5kez.default and then saved the file.

Thunderbird saved all my old email data to the new machine.

It is also possible to open Terminal and use Profile Manager:

Code:thunderbird --ProfileManager