To Set up email in the Mail app for Windows 10:
Open the Mail app by clicking the Windows Start menu and choosing Mail.
If this is the first time you've opened the Mail app, you’ll see a Welcome page. Select Add account to get started.
If you've used the Mail app before, at the bottom of the left navigation pane, select Settings , and then choose Manage Accounts.
Note: On a phone or tablet, tap the three dots at the bottom of the page to access Settings.
Select Add account.
Choose Exchange, Office 365.
Enter the required information and click Sign in. For most accounts, this is your email address, password, and the account name.
The account name is what you'll see in both the left pane of Mail for Windows 10 as well as the Manage Accounts pane.
Click Done. Your data will start syncing as soon as your account is set up.