I have an iPhone user that just recently noticed that his iPhone calendar changes are now overwriting any changes made in Outlook. I checked and didn't see any config settings on the iPhone for whether the device or Exchange "wins". Does anyone know where this might be configured?
Last change wins, generally.
There are two scenarios I can think of here based on the wording of your question - which one are you referring to:
If it's 1, that's an issue. If it's 2, that's expected behavior. Can you clarify further?