Ok, so you have been stuffed at WIPO:
http://arbiter.wipo.int/domains/deci...2004-0174.html
I had a quick look and saw that the panelist (sole) seemed to use the Benelux trademark laws as you are both resident there, however that seems a bit strange considering it was a .com domain. I could understand it more if it was a .nl.
BTW is your lawyer a specialist in internet law?