That is an Apple Address Book restriction, not a SOGo one.
It only synchronizes one address book via CardDAV, namely the first one.

Please complain at Apples Support.
There is nothing Inverse can do about it.

What about an "optional" Option in SOGo Config like "SOGoAggregateAddressBooks" to aggregate all users addressbooks to a single one which is distributed to the User (AB).

We have a Shared Addressbook which is not the LDAP AB. This AB belongs to me and i share it r/w with all others in the Company. So it would be a great idea to add such an Option. Would solve the Macs AddressBook Problem.

@Christian Mack:
Are you sure?
From what I've seen so far, I'd guess Adressbook.app is capable of doing that, but SOGo doesn't provide the correct information.
Also I think I remember this was working some time in the (distant) past. Might be wrong, though.

Side note: You can still get Adressbook.app to sync a address book other than your personal one. All you have to do is mess with your config file.

Once you have configured your CardDAV account in Apple AddressBook.app, you should see a section named "Directories" with the name of your CardDAV account under it. As in the Web interface, no entries will appear until you perform a search. Notice that if you have multiple user sources, only the last one will be query.

@francis:
This functionality is available for MacOS 10.7 Lion , but not for MacOS 10.6 Snow Leopard.

And in Lion, as you said, only the last global user source is queried (in our case the wrong one ;-) ).

I understand that it's Mac developers fault. But the question is not - who is wrong in this case, but how to cover this issue. Maybe the developer, who knows SOGo much better then a simple user can propose a workaround?
The task is - to have personal and global addressbook for each user. If it's not possible with current software in a easy way, maybe we can trick them somehow to achieve needed functionality? My try was to add another virtual server in apache with rewriting of .../personal/ to .../public/ url request to sogo and putting this vhost as another carddav source to Lion's addressbook.app. But I failed, also because of luck of protocol debugging applications - sogo sends gziped body response to mac addressbook. Would really appreciate a hint to solve this feature somehow and not only waiting for Apple to rewrite their application in appropriate way.