I have an iPhone 5 and dont think the office functions work properly. It does show text messages....but only if they are received when in the car, and it doesn't show existing texts.
Emails on the phone don't show on idrive either. I think you can set up something on the connected drive website to redirect email or something, but never looked into it.
Dont know if IOS 7 will help perhaps, but I don't think these things are listed as being supported on the iPhone.