At this i point, i think it would be really nice an "extended" contact properties editor, including also the sync server... with the option of "detach" all contacts from sync, or assign all contacts to a certain server.

I think it's fairly safe to say that Nokia won't be doing this at this point. It would probably be possible to do as a standalone application with some effort, I am happy to try answer questions if someone wants to work on that.

Ok, so... how can i access the LINKED informations tu a given contact, i.e. the sync server?
Can you give me some code examples?

I know this is a BIG question...

Contact information is accessible using the QtContacts API. A contact in your addressbook is made up of one (or more) QContact instances aggregated together in the UI (yes, sorry, not fantastic architecture, but we've been locked into it for an awfully long time).

QContact instances contain QContactDetail instances which are the actual information about a contact, e.g. a QContactName detail contains their first/last/etc names, QContactPhoneNumber contains information about one phone number for the contact. You get the idea.

To find where a contact is synced to, you want the QContactSyncTarget detail (http://doc.qt.nokia.com/qtmobility/q...ynctarget.html)