Hi I've been having this issue,
I've found creating a registry key under HKCU\SOFTWARE
for zimbra was enough to get going,
something like
Code:
Windows Registry Editor Version 5.00
[HKEY_CURRENT_USER\Software\Zimbra]
"GalResync"=dword:0000001e
"GalDeltaSync"=dword:000000f0
"SigSyncEnabled"=dword:00000001