Hi - welcome to the Volvo fold.
This forum is for the new XC90, and the new sat-nav may not be compatible with the old system.
You might get a more helpful response from current Mk1 owners if you post your question on the Mk1 XC90 forum -
http://www.volvoforums.org.uk/forumdisplay.php?f=37
Best of luck.
Regards.