|Mobile Device Setup|
Set up email using the iOS mail app
Set up an Office 365 for business Exchange-based email account on an iPhone or iPad
Select Settings > Mail, Contacts, Calendars > Accounts > Add account > Email.
Type your full email address and password, and then tap Next.
If the iOS device can't find your settings, you need to add them. If you have an Office 365 Exchange email account, in Server, type outlook.office365.com, then add your Username and Password. This is the same username and password you use for work.
By default, Mail, Contacts, and Calendar information are synchronized. Tap Save.
If you're prompted to create a passcode, tap Continue and type a numeric passcode. If you're prompted and don't set up a passcode, you can't view this account on your device. But you can set up a passcode later in your settings.