Re: The beginning of the end...
"for 3rd party client access?"
As far as I am concerned that has already happened. I've spent several weeks nibbling away at getting Pegasus v4.80 to connect to Office 365 with IMAP using the Oauth system. Tomorrow is drop-dead day - and OWA is a very poor substitute.
I haven't even got as far as entering any values in Pegasus's config. The MS instructions keep wittering on about QR codes and downloading smart phone apps. The hopeful screen shots to select "App Password" don't agree with what I see - that option is missing even though 2FA has been set for the user.
Microsoft was not my favourite supplier in recent years - but the amount of pain (sometimes body literal) is making me hate them now. My GP will not be impressed by my current regular blood pressure readings.
It was easy to make the same Pegasus transition for Google mail. It seems preferable to transfer all my emails to Google until I can find a non-MS email service to which to transfer my domain.
Any UK non-MS email service recommendations?