Sync problem with contacts

[Bochum74]

Good morning,

I tried to find a solution using the search function but it wasn't successful.

Environment:
Zimbra 6.0.7
Outlook 2003 SP3
ZCO 6.0.6_GA_2324_6.0.5902.6
Windows 7 x64
salesforce

Here's my problem:
I have approximately 1220 contacts in Zimbra and Outlook. After changing a contact (phone number, remarks,..) in Outlook I noticed that sometimes Zimbra didn't inherit the changes and vice versa.
I tried a lower sync token number without success and there is now failure notice or error message. I checked the issue on another Windows client with the same result. The Problem appeared also in Zimbra version 5.

Anyone knows a solution for this behaviour?

If you need any additional information don't hesitate to ask me

Thanks in advance.

Br,
Andreas

[fsiegel]

If you have a failure notice, please send it. Local failure or server? There are also attachments to that which give good information.