I couldn't get my phonebook to transfer, not even the SIM Card contacts), on my Cingular Siemens SX66 to work on my 07/05 production date X5. I was able to pair and use the phone however.
The solution may be to simply use the phone's contact section as the phonebook. These guys
http://www.thepocketsolution.com/sto...c=Siemens_SX66 have a nice holder for the SX66.