HTC One M8 for Windows - Manual (Page 114)

Email
Adding a Microsoft account
When you first set up your phone, you're asked to sign in with your
Microsoft account. If you didn't sign in then or if you have more than one
Microsoft account, go to Settings to set up your primary Microsoft account
or additional accounts.
1. Swipe down from the top edge of the screen with one finger.
2. Tap All settings > email+accounts.
3. Tap add an account.
4. Do one of the following:
§ To add your primary account that you will use for email and
other Microsoft services on your phone, tap Microsoft
account.
§ To set up additional email accounts, tap Outlook.com >
connect.
5. Enter your email address and password, and then tap sign in.
Your Microsoft account email, contacts, calendar, photos, and feeds will be
synced to your phone.
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