Using classic Outlook for Windows in business environments
Olli, thanks for your feedback. After making the earlier post, things have improved. The pop up box asking for the password to be entered has stopped appearing, but every few hours I get a message in the taskbar notification area stating 'Outlook is attempting to connect to myaccount@outlook.com. If your password has changed it may ne'. (The notification box doesn't display the full message, I guess it should finish 'need resetting.')
I've been ignoring this message because Outlook 2013 remains synchronised with my account and so the notification doesn't make sense.
I haven't found a way to understand if Outlook 2013 is currently connected using an 'app password' or if it is using 2-Factor Authentication in the background.
Whilst it continues to work, I won't experiment further!