Hi, I'm very happy to somehow use CalendarServer-4.2 for CalDAV. Therefore I followed mostly the instructions of http://www.ronregev.com/misc/pim_server_tutorial/ - even if they are old. Following the steps depicted there I'm able to synchronize my calendars. But how can I configure address books with CalendarServer? I did not find nothing for this topic. For the sake of completeness I add here, what I did for the calendars: On my server I made svn co https://svn.calendarserver.org/repository/calendarserver/CalendarServer/tags... cd CalendarServer-4.2 ./run -s Copied CalendarServer-4.2/conf/caldavd-test.plist to CalendarServer-4.2/conf/caldavd-dev.plist and changed in caldavd-dev.plist internal IP addresses and BindAddresses as written in http://www.ronregev.com/misc/pim_server_tutorial/. Then I changed CalendarServer-4.2/conf/auth/accounts-test.xml that it now reads <?xml version="1.0" encoding="utf-8"?> <!-- ...License stuff... --> <!DOCTYPE accounts SYSTEM "accounts.dtd"> <accounts realm="Test Realm"> <user> <uid>admin</uid> <guid>admin</guid> <password>PASSWORD</password> <name>Administrator</name> </user> <user> <uid>MYUID</uid> <guid>MYUID</guid> <password>PASSWORD</password> <name>Stefan Bollmann</name> <first-name>Stefan</first-name> <last-name>Bollmann</last-name> </user> <group> <uid>group01</uid> <guid>group01</guid> <password>group01</password> <name>Group 01</name> <members> <member type="users">user01</member> </members> </group> </accounts> admin password was changed. now cd ~/calendar/CalendarServer ./run Then I opened iCal-> Preferences->Accounts tab->+ and configured an account with user name, password and server address with ssl like in accounts-test.xml. Now everything works fine with this calendar, I can change it on clients and everythings fine. I did not do the guid things described in http://www.ronregev.com/misc/pim_server_tutorial/. But here the applicability of the Howto ends... Thanks in advance, Stefan -- "We do not know, but we are willing to bet that your child who is too irrational to be deterred by your threats of punishment is a better instinctive game-player than you are." aus Strategic Thinking, Dixit, 1991