Push email, contacts and calendar with Zimbra 6 Opensource & Z-Push – ActiveSync

I wonder if anyone has linked these two together with the TKL Zimbra appliance.  It would be nice to have both a active sync version of Zimbra, and also to have one that upgrades to Lucid somehow.

http://www.slashdevslashnull.com/2010/02/push-email-contacts-and-calenda...

Any thoughts on easy or difficulty of putting these together?

best.

L. Arnold