A much better idea would no use the SNAP version of Thunderbird that comes with ubuntu latest. ie stick to Arch packages instead of snaps. The snap package causes all sorts of issues as the sandbox is not correctly configured.

We're going from Ubuntu to Mint mostly due to SNAP problems.

We are using the deb version of Thunderbird

I don't understand how not using the SNAP Thunderbird answers my question about migrating from an older version of Thunderbird to the latest

A much better idea would no use the SNAP version of Thunderbird that comes with ubuntu latest. ie stick to Arch packages instead of snaps. The snap package causes all sorts of issues as the sandbox is not correctly configured.

The upgrade should have no problem. I have done that with no issues.

Thanks!

I've got an older machine to test on but wanted to figure out the process 1st.

The upgrade should have no problem. I have done that with no issues.

Copying the profile did not work. Using export / import mostly worked.

Ran Thunderbird -p, set up a profile and folder, copied contents into that folder, used profile manager to run it and it went right into new account set up.

Using export / import: It set up the account, had my folders and messages but not my address books. Which I set up by exporting / importing the address books separately.

Seems fine now, after putting in my password it sends / receives emails as expected.

The upgrade should have no problem. I have done that with no issues.

2025-02-22 Tried it again prior to the move, so everyone could get a look and this time just copying the profile worked. No problems seen, message, address books, add-ons look okay.

Not sure why copying failed during the initial test.