We recently got ZCB, BES, etc running. It works great syncing from the server to the device. However, the device up to the server isn't reliable at all.

Tasks sync from the device up to the server sometimes takes 5 minutes and others 10-15 minutes. Calendar entries entered on the device do not sync up to the server at all. This is the biggest issue. Calendar entries entered on the server sync almost instantly, but not the other way around. Ideas?