The subject says it all. How well is BES Express working with Zimbra 7.1?

In addition, I do have another question. Is there any decent documentation on how to get the two of them working?

I only have a single Blackberry user who won't give it up and just move to an Android device or iPhone. They are in the "It just works" category while the damned Blackberry still hasn't got on the simple connectivity bandwagon.