To setup your iPhone with your existing Office 365 email account using Exchange ActiveSync, follow these steps:
Finding My Server Name
To determine your Exchange ActiveSync server name on Apple devices running iOS 4.x or 5.x (for example, iPhone 3G, iPhone 3GS, GSM/CDMA iPhone 4, iPhone 4S, iPod Touch 2nd generation, iPod Touch 3rd generation, iPod Touch 4th generation, iPad, and iPad 2), do the following:
Feb 13, 5:31pm – After further review: All day today we have been testing Office 365 on our mobile devices. I discovered on my iPhone that if I put in a server address of m.outlook.com, it would eventually work. It just takes about 5 minutes. After my iPhone started downloading email, I went back to the server settings and discovered that the server had been automatically changed from m.outlook.com to the snXXXXXXXX.outlook.com address I originally used. But m.outlook.com is easier to type. :)
I also noticed that if I deleted the exchange account and attempted to re-add it, the iPhone would default the server to the podxxxxx.outlook.com address that I found following the steps above. If I just left that server name in the account, it would also work. But again, when I went back to settings after the email started downloading, the server had been changed automatically to the snXXXXXXXX.outlook.com address.
These server addresses did not seem to work last night. But today they do work. It may be that we just needed a little bit more time for these addresses to propagate to wherever they need to propagate to.
I should also note that I had originally thought that the snXXXXXXXX.outlook.com address was specific to our organization’s email account on Office 365. However, we discovered today one of our employees gets directed to BLXXXXXXXX.outlook.com when they go to Outlook Web Access. And this was the only server address that would work on his phone–he could not use the address that the rest of us use. So, we cannot just send out a single server name to everyone. It appears to be mailbox dependent. But, after the rest of the testing we did, I believe that m.outlook.com would work from any of our devices.
Once this is done, your iPhone should start downloading your Mail, Contacts and Calendar items from Office 365.
If you have another device, want to setup your iPhone email using POP or IMAP, or just need more help, check out this Microsoft Office 365 Mobile Phone Setup Wizard.
This applies to: Office 365 for professionals and small businesses, Office 365 for enterprises, Microsoft Exchange, Live@edu.