Notes R6.50 Client and Server tested ok. No problems occured with the above mentioned settings.
For those on Terminal server installations. Notes on the terminal server must be closed before sync of contacts because of locked names.nsf. Todo and Calendar works ok.
My Terminal server Notes installation complies with this guide:
http://www-10.lotus.com/ldd/nd6forum.nsf/55c38d716d632d9b8525689b005ba1c0/934a243a3a3a3bb685256c92008362a5?OpenDocument
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