iPhone - iOS Client Adding a 365 mailbox to your phone iPhone     Go to your device's  Settings , scroll down and tap  Mail  >  Accounts  > Add Account .   Select  Exchange .     Enter your Microsoft 365 email address, password, and a description of your account. Tap  Next .   The Mail app may request certain permissions such as accessing your calendar and contacts. To agree, tap  Yes . Then choose the apps you want your email account to sync with your iOS device and tap  Save . Now you're all set to go!