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Add Office 365 Email on Windows 10 Mail App
Windows 10 Email App allows you to connect to your Office 365 subscription, if you are not using Outlook. This guide is to help you set up Windows Mail App for Office 365
Click on the Mail App in the Taskbar

Windows Mail Splash screen

Click the + Add Account to setup your Office 365 Email

Click on the Office 365 Icon

Enter your email address

Windows Mail App will ask you for your username and password.

This section is very misleading to the user, great for an administrator.
Generally speaking, most organizing will allow you to use work email on a personal device, if you agree to have your computer managed by the company. This isnt managing the entire computer, just the Office 365 data that is stored on that computer.
If you are planning on using this machine with just email then you can uncheck the box on Allow my organization to manager my device. You can also click, No, sign into this app only.

Once you have the credentials entered and selected if you want your computer managed or not, Office 365 will create the mail account for you.

Once Mail App is setup you should be all set to use your Office 365 mail.

Example Mailbox

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