Anyone using both WP7 and iPhone? Got a question

Out of the box it doesn't have integration except u can download and use facebook app which does have push notifications. You can also use 3rd party IM clients like IM+, trillian, beejive. All of them are enabled to run in background as well but it doesn't have full integration like WP7 does

 

I use both

iPhone has nothing that really integrates both...though theoretically one could be written, as 3rd party apps are supported for SMS messaging (they can send, and I believe display conversations, though I may be wrong there)

However, Facebook makes a pretty wonderful messages app for iOS. It is essentially the same chat functionality that is baked into the Facebook App, but it is stripped out into its own app so that you get a more streamlined experience. It has push notifications, etc and works well. I've used it. Its not as great as the windows phone version, but it works well enough