One of the great things about Exchange Online and the Microsoft Business Productivity Online Suite is that it works seamlessly with nearly any Smartphone.  This guide will show you how to connect your iPhone to BPOS.

How to Connect an iPhone to BPOS

The iPhone 3G, 3GS, or 4 can be used to connect to BPOS as long as it is running iOS 4.0.1 or newer. This procedure can also be used for the iPod Touch, with the same iOS requirements.

The iPhone only supports a single Exchange Account. If you already have configured your iPhone to connect to an Exchange server, then you'll need to delete your old account settings before you can add your BPOS Exchange account.

Note that when you delete an Exchange account, any mail or data on your phone for that account will be removed.

--> The rest is on Petri's Website :

http://www.petri.co.il/iphone-configuration-for-bpos-exchange.htm