As if I didn't already know it, #Microsoft customer support has proven to be useless. I requested an export of my #Outlook (.com, not the desktop app) email account over a week ago. The page said it'll take up to four days. I contact support and they tell me that exporting online isn't supported. Why offer it then‽
So I downloaded #Thunderbird, connected to my account and have synced my inbox. Currently exporting it using an add-on.
Next job after that is to import it to my new @Tutanota inbox, then cancel my Outlook subscription.