I have a mixture of MotoQ, Droid, and iPhones in our organization. After upgrading us from 6.0.2 to 6.0.4 this weekend, our 8 MotoQ phones no longer sync. I use a variation of the instructions here to setup MotoQ's:

Mobile Device Setup - Zimbra :: Wiki

These have worked for years using this method. Obviously, I have a handful of mobile users that aren't happy. I cleared out a MotoQ a little while ago and set it up from scratch and the issues still exists.

Can someone lead me in the right direction on troubleshooting this? The phone itself offers no diagnostic information other than "Failed to sync - try again later." Not sure what to look for on the Zimbra server logs.