Is there a troubleshooting guide for the Verizon iPhone 4 and BPOS?

One of the easiest things you can do it to validate the logon by trying it on webmail first. If that works, then make sure the protocal is enabled with ADUC. If those things seem to work, turn on the http logging on your front end server. You may also need to check the data plan for device. If other devices are working, it must be that one.

Hi What issue are you having? You can use https://www.testexchangeconnectivity.com/ to test activesync for Exchange. Sukh

The articles below will help: "If your iPhone is currently running iOS 4, you must upgrade your device to iOS 4.0.1 in order to connect to Exchange Online” --------Refer to <Client Computer Requirements> Resources: Use an iPhone with Microsoft Online Services Notes: This forum is for the issues on the on-premises exchange product, for the question about exchange online in the BPOS please use the “Exchange Online” forum which would be the best place for seeking the advicePlease remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.