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I've copied my old AppData/.../.../Profiles to my new computer. I started Thunderbird, and it created a new default file, in the same directory. ????

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No matter what I do, Thunderbird wants to use the new .default file, rather than the one I already had in the directory. In the past, that's all I needed to do, so I'm not sure what step I left out. I was using POP3 on the old computer, if that matters. So how do I get Thunderbird to use the .default file that I brought over?

No matter what I do, Thunderbird wants to use the new .default file, rather than the one I already had in the directory. In the past, that's all I needed to do, so I'm not sure what step I left out. I was using POP3 on the old computer, if that matters. So how do I get Thunderbird to use the .default file that I brought over?

Chosen solution

Instead of copying the C:\Users\<usernameoldpc>\AppData\Roaming\Thunderbird\Profiles folder, copy the C:\Users\<usernameoldpc>\AppData\Roaming\Thunderbird folder to C:\Users\<usernamenewpc>\AppData\Roaming, replacing whatever Thunderbird folder may already exist. That will include the profiles.ini file that tells TB to use the profile folder from the old PC.

https://support.mozilla.org/en-US/kb/moving-thunderbird-data-to-a-new-computer

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Chosen Solution

Instead of copying the C:\Users\<usernameoldpc>\AppData\Roaming\Thunderbird\Profiles folder, copy the C:\Users\<usernameoldpc>\AppData\Roaming\Thunderbird folder to C:\Users\<usernamenewpc>\AppData\Roaming, replacing whatever Thunderbird folder may already exist. That will include the profiles.ini file that tells TB to use the profile folder from the old PC.

https://support.mozilla.org/en-US/kb/moving-thunderbird-data-to-a-new-computer