Microsoft is building a universal Outlook client for Windows and Mac that will also replace the default Mail & Calendar apps on Windows 10 when ready. This new client is codenamed Monarch and is based on the already available Outlook Web app available in a browser today.
Project Monarch is the end-goal for Microsoft’s “One Outlook” vision, which aims to build a single Outlook client that works across PC, Mac, and the Web. Right now, Microsoft has a number of different Outlook clients for desktop, including Outlook Web, Outlook (Win32) for Windows, Outlook for Mac, and Mail & Calendar on Windows 10.
The mail client in Windows will carry the well-known Outlook brand and will be a web app. You know, just in case you wanted to know how much faith Microsoft has in its own native application platforms. If not even Microsoft itself cares enough to write native Windows applications, then who does?
The Windows application ecosystem is a complete and utter mess.