Microsoft replacing windows Mail with a new Outlook app. It is built using the same scripts as Outlook on the web, but in an app framework. It supports multiple accounts, currently only Outlook.com, Microsoft 365 Work or School, and IMAP accounts.

Automatically Open New Outlook when Windows boots
How to enable New Outlook for Windows to run automatically when you boot the computer.

Save Messages in New Outlook
Learn how to save messages to the hard drive when using new Outlook app or Outlook on the web.

Block External Content in New Outlook
How to block external content in the new Outlook that replaces Windows Mail app.

Reset the New Outlook Profile
When you switch on the new Outlook, it pulls accounts in from your Outlook desktop profile. I'll show you how to clear the profile and create a new profile.