Use the same format for email addresses as everyone else (as standardized in 1982, for chrissakes) while also allowing users who aren't capable of retraining to revert to "Microsoft format" easily by mouse click or GPO.
The nonstandard semicolon delimiter and "friendly names" are a blight on humanity.
Type isread:no in the search box, click both "all folders" and "all dates"on the next screen, and you have a slow, inefficient way to simulate the quick and efficient unread mail monitoring that used to be available in all versions of Outlook, but has apparently been eliminated from OWA, O365 and iOS versions.
First, I want to thank everyone for using the product and sharing with us your feedback.
This is great feedback and we are discussing the need to provide the basic filtering function for Search. We will update once a decision is made.
In the mean time, I’d like to share a temporary solution to ease your pain. It’s a bit more technical so not everyone is going to be comfortable with it. I apologize for that in advance. You can add “isread:no” (without the quotes) after the search term (separate your search term and isread:no with a space) which will filter the search results to show only unread emails.
Thank you for helping us make Outlook.com better!
The search folder for unread messages across ALL mailboxes has now also been removed from the (pointlessly renamed something else) Outlook Web Access feature of Exchange 2019 on prem.
To be clear, MS is extending the reach of this problem, making it impact more users, rather than fixing it.
Like many MS customers, this was a critically important feature for me, that I used dozens of times daily.