Microsoft <A HREF="http://news.zdnet.com/2100-1009_22-5380485.html?tag=zdnn.alert">has filed nine new lawsuits</A> against those it says are responsible for spam, including a Web-hosting company that caters to people who send unsolicited email. With the latest batch of lawsuits, Microsoft said it is involved in more than 100 legal cases against spammers. Those cases include more than 70 lawsuits filed in the United States.