Set up Office365 exchange email on iphone or ipad using the iOS mail app
Set up an Office 365 for business Exchange-based email account on an iOS device-
Tap Settings > Accounts > Add account > Email.
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Select Exchange.
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Type your full email address and password, and then tap Next.
If the phone cannot 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 (email address) and Password.
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By default, Mail, Contacts, and Calendar information are synchronized. Tap Save.
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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. You can also set up a passcode later in your settings.