I had a bunch of messages in Thunderbird which I wanted to give to a coworker. I didn’t want to forward 60 messages, so I figured I’d save them as .eml files.
Unfortunately, Thunderbird only lets you save to file one message at a time. Who wants to File/SaveAs/File/OK sixty times? Not me.
Fortunately there’s a great little extension called ImportExportTools. After installing it, I went to File / Save Selected Messages / EML Format and watched it do what I didn’t want to do, sixty times.
I won’t mention all the other export and import features. Just get it and install it if you use Thunderbird. You will use it at some point.