Microsoft is rising quickly on a running list of the Top 10 Worst Spam Service ISPs as maintained by spamhaus.org, a group that tracks unsolicited commercial e-mail. The software giant debuted on the list earlier this month at number 9 (one being the worst), and has slid over the past few days down to number 5. Spamhaus says spammers and scam artists are abusing Microsoft’s live.com and livefilestore.com properties to redirect visitors to sites that peddle fake pharmacy products, porn and Nigerian 419 scams. Spamhaus explains how entities wind up on its Top 10 list: Although all networks claim to be anti-spam, some network executives factor revenue made from hosting known spam gangs into corporate policy decisions to continue to sell services to spam operations. Others simply decide that closing the holes in their end-user broadband systems that allow spammers access would be too costly to their bottom lines. Richard