Both. "New" outlook doesn't work with all of the add-ons and plug ins that "classic" outlook did. Both new and classic have copilot wedged into them. Classic has unasked for and unwanted Linkedin integrations that have to be turned off on a per-user basis, and it is patently clear that microslop has every intention of abandoning classic outlook the instant they believe that they can do so without severely alienating their userbase.