The following instructions will show you you to setup your Office 365 email on your iOS device (i.e. iPhone or iPad) using the native Mail app for iOS.
Alternatively, you can download the Outlook mobile app from the App Store. For instructions, please see the following article: How do I setup Office 365 email using the Outlook mobile app on my iOS device?
1. Open Settings 
, then select Passwords & Accounts.
2. If necessary, select Add Account, then select Exchange.
3. Enter your Vol State email address, add a description of your choosing, then select Next.
4. Select Sign In
5. Enter your Vol State credentials on the following screen.
6. Select the services associated with your account that you would like to sync to your device, then select Save.
You now have access to your Vol State email using the native Mail app for iOS.
You can change the settings at anytime by using Settings > Passwords & Accounts.