Project Monarch is “One Outlook” replacement for Mail & Calendar apps

Microsoft is creating a new Outlook client app, which will utilize the existing Outlook for Web software. The new project is codenamed Monarch, and it follows Microsoft's "One Outlook" vision.

Outlook Banner

The new app will be available for Windows and Mac. On Windows, it will replace the default Mail & Calendar apps. Microsoft's goal is to create an universal Outlook client that works and looks identical everywhere. The company calls it One Outlook.

As of now, there is a variety of Outlook apps available from the Redmond software giant. The list include Outlook for Mac, Mail & Calendar in Windows 10, a web app (website), and a special desktop Outlook app which can be installed with Microsoft Office.

The new app will work like a native Windows app, with the ability to store persistent data on your drive, and will also have everything that modern Store apps do, including notifications, sharing, and other similar options.

There are some screenshots already available. Unfortunately, they do not reveal much.

One Outlook App 1
New One Outlook App. Image credits:
One Outlook App 2
New One Outlook App. Image credits:

Prior the "Project Monarch" release, the Mail & Calendar app will receive a refreshed user interface with the major Sun Valley update in Windows 10 21H2, similar to how other built-in apps see UI tweaks.

While the source doesn't mention it, it is obvious that the above can be changed at any moment. I wasn't able to find an official announcement of Project Monarch, so it is most likely only a planned feature.

Support us

Winaero greatly relies on your support. You can help the site keep bringing you interesting and useful content and software by using these options:

If you like this article, please share it using the buttons below. It won't take a lot from you, but it will help us grow. Thanks for your support!


Author: Sergey Tkachenko

Sergey Tkachenko is a software developer who started Winaero back in 2011. On this blog, Sergey is writing about everything connected to Microsoft, Windows and popular software. Follow him on Telegram, Twitter, and YouTube.

4 thoughts on “Project Monarch is “One Outlook” replacement for Mail & Calendar apps”

  1. Can’t wait for them to try to replace Office Outlook with it, then realise that it sucks and that nobody likes it and go back to good old Office Outlook lol.

    1. OneNote migrated to new app, older version not developed as 2019, exist only as 2016.
      Outlook can expect this same fate.

      1. Well they did resurrect it, removed “2016” from the name, renamed UWP one to “For Windows 10”, so you could say that Office OneNote is back and is now “2019”. They also added a proper dark theme, integrated sticky notes, etc.

Leave a Reply

Your email address will not be published.

Using Telegram? Subscribe to the blog channel!
Hello. Add your message here.