https://monarch.azurewebsites.net/
Error 403 - This web app is stopped.
The web app you have attempted to reach is currently stopped and does not accept any requests. Please try to reload the page or visit it again soon.
https://www.windowscentral.com/project-monarch-outlook-web-universal-email-client-microsoft
Microsoft is building a new Outlook app for Windows and Mac powered by the web
