Microsoft has refreshed the Outlook Mobile architecture. They suggest that you run some PowerShell to report clients connecting via the old and new architectures. Their code works, but we think ours is better.
Microsoft has a new OWA user interface in targeted release. So far it all looks good even if some features are still missing, Expect to see the new UI generally available in late 2018 or early 2019.
Microsoft has published some statements about not allowing older Office clients to connect to Office 365 from October 2020. Well, the word “allow” should really be read as “support.” Or so we hear.