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Tux Machines (TM)-specific
This Tutorial will explain how you can import mails from Thunderbird to Evolution. Changing email clients can be a risky task, as you usually want to keep your old email just in case you need to refer back to it.
This can usually be easily done by using the Export function from the client you want to move from, and finally import to your new client using the Import function.
Unfortunately, Thunderbird does not offer an export option yet. Because of that, importing your old mails to Evolution is not made that easy. But, luckily enough, Thunderbird uses a standard mail box format: mbox. mbox format is suported out of the box by Evolution through its import feature.
We know that we can easily import mails from thunderbird, the only thing left, is to find out where those emails files are. The location can be found through the account properties page. In Thunderbird go to Edit—>Account Settings… and select the account you want to import the mails from, then select the sub-entry Server Settings and look for the Local Directory text field. It should look like: