HTC One M8 for Windows - Manual (Page 115)

§ The first Microsoft account that you set up can't be deleted from
your phone.
§ If you set up additional Microsoft accounts, photos from these
accounts won't be synced to your phone.
Adding a POP3/IMAP email account
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. Choose the type of email account that you want.
If you don't see it in the account list, tap other account.
5. Enter your email address and password.
§ If you're adding your Google Account, you can choose to
sync email messages only or sync your Google contacts and
calendar as well.
§ If you're setting up other POP3 or IMAP accounts, your phone
can only sync email from those accounts.
6. Tap sign in.
Your phone then looks for your account settings, completes the setup, and
syncs information from your account.
Email 115