To print an email from within your Outlook Web App (OWA):
Launch an internet browser (Internet Explorer (IE), Firefox, Chrome, Safari)
Sign in using your login credentials
The message will open, click the 3 dots (...) located to the right side of the message
A printing window will open.
NOTE: You can make any adjustments, such as the number of copies or switch printers, if available.
Your email will begin printing.