Microsoft warns against using leaked beta of unreleased One Outlook app for Windows 11
In recent days the yet-to-be-released successor to Windows 11's Outlook app leaked online. Called One Outlook, this unreleased beta version is known as Project Monarch.
This is not the first we have heard of One Outlook; it was originally scheduled for release last year, but the launch was delayed. But the leak was the first time anyone has been able to try out the app, but Microsoft has issued a warning saying that this is an "unsupported early test version" which is missing features.