Although mail, calendar does sync between zimbra desktop and zimbra web client, tasks, briefcase and contacts doesn't. I can not see a task created on web client on the zimbra desktop and vise versa. It is the same for briefcase and contacts. Are there anyone has the same issue and/or knows the solution?

ZCS Version: Release 8.0.6_GA_5922.RHEL6_64_20131203103753 RHEL6_64 NETWORK edition. (trial)
Zimbra Desktop Version: Zimbra Desktop 7.2.2_11951_Windows