When trying to connect to a SOGo server with CardDAV and Addressbook of Mac OS X 10.8 aka Mountain Lion, this fails.

In the SOGo logs, there is something like:

[WEClientCapabilities initWithRequest:]: Unknown WebClient: user-agent='Mac OS X/10.8.1 (12B19) AddressBook/1143'

There are some other issues like 0001913 with similar problems (Calender there). So the user-agent string has changed in 10.8 and SOGo refuses as unknown web client.

Edited SoObjects/SOGo/WORequest+SOGo.m and changed isMacOSXAddressBookApp to:

• (BOOL) isMacOSXAddressBookApp
  {
  WEClientCapabilities *cc;
  BOOL b;

  cc = [self clientCapabilities];

  b = [[cc userAgent] rangeOfString: @"AddressBook"].location != NSNotFound;

  return b;
  }

This fixes the problem for me...