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tl;dr: How can I import Outlook 2013 messages into Thunderbird?

Background: I used Outlook Express until Microsoft killed it, and have used Outlook 2013 since. Now Microsoft has forced me to abandon that due to Oauth2 not being supported, so I am looking for a replacement.

Thunderbird seems to be a recommended solution, but despite poking around in the community forums and help files, I am not finding straightforward answers to my questions on the current platform. (Side note: I have been using Firefox since it was Phoenix and then Firebird, and then Firefox, but never really used Thunderbird.)

I found and attempted to follow the instructions for import here: https://support.mozilla.org/en-US/kb/thunderbird-import but it must not work with older versions of Outlook, as I got a message saying "No profile found." (I ran it under the same user, an admin, that has the Outlook 2013 installed, so I don't know where it is looking for that profile). Import from a file doesn't give the option to use the Outlook file types.

So, given that, how can I import my email and address book from Outlook 2013?

Thanks in advance!

Even though Thunderbird is not my default email client, when I create an email out of my Access database, Thunderbird intercepts the outgoing email and loads instead of Outlook. If I uninstall Thunderbird, Outlook opens as usual.