New in the community, i've a good news for us !
After 3 weeks of hard work i've manage to syncronize Zimbra open-source 4.5.6 through a Funambol Client. I've installed a sync4j based webserver, compatible with all the funambol 6 clients.
I've test it with my smartphone with the Funambol client. It works well. I can synchronize all the contacts and the calendar.
The contacts are sync from zimbra to client and from client to zimbra and the same thing for the calendar. All the calendar categories are sync too.
SO NOW you can sync Zimbra open source with mobile all the mobiles, palmand pocket pc + Outlook.
It were wery difficult and i won't can make a tutorial now. I can help you to install it if you want, or install it for you on your server. Ii add that i installed it on a Ubuntu Server LTS.
I can help you to install, Personal Zimbra server if you want.
Have a good week-end