First public preview

One Outlook app preview releases for Windows 11

You can now test the new One Outlook app on Windows 11 or 10, but you need a commercial account.

One Outlook preview on Windows 11 desktop
  • Microsoft releases the first preview of the One Outlook app for Windows 11.
  • The app is only available for paid customers with a commercial account.
  • One Outlook app still missing many essential features like multi-account support.

After several leaks, Microsoft has begun the new One Outlook (Project Monarch) app rollout for testers enrolled in the Office Insiders Beta Channel. However, the first public preview of the app is only available for paid customers with a Microsoft 365 business or education account.

If you have a commercial account and the installation of Office is in the Beta Channel, you will now find a “Try the new Outlook” toggle switch in the top-right corner to switch to the new version.

The new application is available for the desktop version of Windows 11 and 10, and it looks identical to the web version of Outlook but with some new features. For example, this email client includes a single view for email, calendar, and tasks. It features a new calendar board and support for Microsoft Loop. Also, the app makes it easier to attach files that are available from the cloud using “@” mentions (@filename).

Furthermore, there is a new message reminder feature to help you remember to respond to an email that may be important. You can drag and drop emails to the “My Day” list to track emails and activities you may need to get done during the day. Elsewhere, you will also find an option to pin emails, new automated policies, and more.

One Outlook inbox
One Outlook inbox (Source: Microsoft)

While the new experience offers a familiar interface with new capabilities, some essential features are still missing. For instance, this version of One Outlook does not support offline mode, and you cannot add multiple accounts from other services like Gmail, iCloud, or other services using IMAP. However, they are under development, and other features like Outlook data (.pst) and Folder reordering are part of the roadmap.

The One Outlook development has been planned as a new solution with one codebase that runs on Windows 11 and 10, web, and macOS.

It’s still unclear if this new version of Outlook will only replace the desktop version of the app for the Office suite or if it will eventually also replace the default Mail app on Windows 11 with limited functionalities.