In message , Paul
writes:
[]
The install process makes a randomly named abcd1234 folder.
A Windows search on profiles.ini, will show up to three
different files belonging to different Mozilla projects.
You select the profiles.ini belonging to Thunderbird.

[General]
StartWithLastProfile=1

[Profile0]
Name=default
IsRelative=1
Path=Profiles/abcd1234.default

You could experiment with:

[General]
StartWithLastProfile=1

[Profile0]
Name=default
IsRelative=0
Path=D:\abcd1234.default

You would copy over the abcd1234.default folder,
before running Thunderbird right after you'd edited
the profiles.ini. The profiles.ini stays in the "well
known place", while the abcd1234 folder can be anywhere.
And with one entry total, there's no need for a ProfileManager
attempt.

Paul

Can you rename the profile folder to something different from the
randomly-generated string at the same time as moving it (and tweaking
the .ini as shown above), or is that string also referred to in other
places?
--
J. P. Gilliver. UMRA: 1960/1985 MB++G()AL-IS-Ch++(p)Ar@T+H+Sh0!:`)DNAf

And Jonathan Harker would never have sent all those letters to his beloved
Mina from Transylvania, he'd have texted her instead. "Stuck in weird castle w
guy w big teeth. Missing u. xxxx (-:" - Alison Graham, RT 2015/11/7-13