
The default Mail and Calendar apps are scheduled to be sunset next year with Monarch combining both functions into the one application. Microsoft will start previewing Monarch towards the end of the year. Microsoft wants to ensure that it feels "native" to each platform while still adhering to the same look and feel as the Outlook website. For example, Monarch will include support for offline storage, notifications, and share targets. While you can technically install Outlook as a Progressive Web App (PWA) now, it doesn't have all of the integrations that Monarch will have. Windows Central says that Microsoft looks to have a single user experience and will be accessible to all customers, business and consumers. Project Monarch will be built on a single codebase in order to simplify deployment across platforms. The effort is called Project Monarch and will look to replace all Microsoft email clients, including the default Windows Mail app. This is part of Microsoft's "One Outlook" initiative that seeks to unify Outlook regardless of platform. Microsoft will eschew dedicated desktop apps for Outlook in lieu of a single client powered by the web, according to Windows Central.

This also seems to be part of a larger initiative to revitalize the Microsoft brand to be amicable to all platforms.

This would allow Microsoft to have a shared experience across platforms without having to deal with differing code bases.

Why it matters: Microsoft is looking to simplify its Outlook apps by using a single client powered by the web.
