This is also useful should a program update go awry.
To find the name and location of your Thunderbird profile folder:
Launch Mozilla Thunderbird.
SelectHelp>Troubleshooting Informationin the menu bar.

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Go toProfile Folder>Show in Finder.
This will display your profile folder inFinder.
It must not be running when you move the profile folder.

Copy the profile folder and transfer it to a different computer, or paste it into the desired location.
and then open it on the other gadget.
If you have a lot of mail, the copying process can take a long time.

you’re able to rename the folder if you desire.
If you have a lot of mail, the copying process can take a while.
Here’s how:
Openprofiles.iniin a text editor.
You’ll find it at/Users/[your username]/Library/Thunderbird/.
Under the profile you just moved, changePath=to the profile folder’s new location.