Ending Harassment from Microsoft and the BSA?

Big_Joe asks: "Lately Microsoft has put a satellite office in the Grand Rapids, MI area. Because of this I, an end user working for a large contractual company, have been getting harassment mail from Microsoft and the BSA. The information they are using to contact me is information from Chicago's Comdex 3 years ago. Since then I have switch my career direction from Windows to Linux. I would like to get my name removed from any association with Microsoft products. The only systems I use with any Microsoft software installed are owned and maintained by my employer. An earlier story here said not to reply because it is more of a headache. So how do I get them to quit bugging me? Is there any legal action I can take for harassment? How do I tell them that I am no longer a customer and that they have no further right to pester me?" Hmmm... smells like more spam. How should one handle any corporation that does crap like this, especially one that makes backhanded threats toward your workplace?