A leaked build of Project Monarch’s “One Outlook” client created some excitement last week, but when you examine the details of the client and what it can do, it’s really just a prettier version of OWA for Exchange Online. That doesn’t mean that Microsoft hasn’t done a bunch of software engineering to prepare the ground to accelerate progress toward the final client. Microsoft has also provided a way to block people using the client, with promise of an official beta soon.
https://office365itpros.com/2022/05/09/project-monarch-leak/
