The challenge is that you need to understand the nuances of the back end email systems like Google Apps to configure it right the first time.
We've setup hundreds of mobile phones for our customer's and the majority arrive from the store or cell phone carrier configured poorly. Blackberry, iPhone, Android all can do Calendar and Contact sync over the cell network without having to "plug in".
Get the setup wrong and you can duplicate or corrupt your calendar and contacts easily. Be cautious hiring your regular computer technician to implement Google Apps as we've cleaned up lots of messes lately. Doing it right the first time costs less.
We can fully understand why lots of errors are made; on an iPhone you add your Google Apps account with the Microsoft Exchange icon so that it uses ActiveSync. Not terribly intuitive since there's a Google Mail icon right below it...
