If you have to move Mozilla Thunderbird data from one computer to another, you can do it by simply copying files between computer.
Folder with Thunderbird profiles is located here:
There will be at least one or more sub-folders with profile data.
What you need to copy is content of Thunderbird profile you want to migrate to new computer.
On destination computer install Thunderbird and in same folder there will be sub-folder with default profile.
Copy all file from source profile to destination and that’s it.
In case you want to create Thunderbird profile in different folder start Thunderbird with following command:
That will allow you to define location of the new profile.
How that helps with migrating Thunderbird between folders/drives or computers.