Is it possible to export a specific mail folder from Mail? Is it possible to export a specific mail folder from Mail.app?

For example, I have a folder of mail messages containing invoices that I need to export and hand over to a new accountant.

In my search so far, I've only found a way to export my entire inbox.
In Mail click the button Show which is in the top left of the application window:


After step one you can see all your inboxes and folders. You can export any inbox or folder via the right-click menu dialog.