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If you already have a Millikin email account set up on your mobile device(s), follow the instructions to remove the old email account first, and then add the new account. Otherwise, simply skip to adding the new account.

Remove the Old Email Account from iPhone and iPad

Tap Settings > Mail, Contacts, Calendars > Add Account.
Tap Microsoft Exchange.
You won’t need to type anything in the Domain box. Type the information requested in the Email, Username, and Password boxes. You need to type your full email address in both the Email and Username boxes (for example, jsmith@millikin.edu). The password is the same password you entered for Office 365 online.
All email logins on the new email system are @millikin.edu not @mail.millikin.edu
Tap Next on the upper-right corner of the screen. Your mail program will try to find the settings it needs to set up your account. Go to step 7, if your mail program finds your settings automatically.
If your iPhone can’t find your settings, you’ll need to enter outlook.office365.com for your server name.
In the Server box, enter your server name, and then tap Next.
Choose the type of information you want to synchronize between your account and your device, and then touch Save. By default, Mail, Contacts, and Calendar information are synchronized.

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If you do not wish to use your Millikin Office 365 account to manage your calendar, you can skip this step. For instance, if you prefer to use another account or icloud to manage your calendar, you do not need to setup Office 365 as your default calendar.

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Also, do the same to set your default contacts to be Office 365. Now when you create a new appointment, it is created on the Office 365 calendar and automatically synced to all your devices and Outlook.