Where to put profile?
In the site https://portableapps.com/support/thunderbird_portable#installing
it reads, "Just copy all of those files to the Data\profile directory within Thunderbird Portable."
It tried to overwrite the existing default profile folder, so I stopped the install and changed the name of the default profile, then migrated the profile and changed it's name to "profile" exactly as the default read.
Presumably I can delete the renamed default profile?