This article explains how to setup an iPhone to access an Office365 mailbox.
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Add Exchange Account to iPhone
On your iphone go to “Settings”, “Mail, Contacts, Calendars” and select “Add Account”
Select Microsoft Exchange
Enter your email address, your username (usually the same as the email address and your office 365 password. You don’t need to enter anything in the domain field.
Tap next and your iphone will try to autodiscover your server details. If it can’t find these you will need to enter the server name of your office365 server see below.
Otherwise click save and you have setup your iPhone.
Optional If asks for server name
You can get the server name from the Office365 webpage.
Logon to office365 at portal.microsoft.com
Go to your inbox and click on the “?” icon and then select about.
Your servername is listed as shown below.