Microsoft and Pfizer have formed an alliance against websites and spammers that sell illegal versions of Pfizer's Viagra pills.
The companies said that they filed parallel lawsuits after a seven-month investigation to unveil the identity of two website owners together with those advertising the websites via huge amounts of spam mail.
Pfizer filed lawsuits against the websites, CanadianPharmacy and E-Pharmacy Direct, while Microsoft took legal auction against the spammers. The companies said that they are targeting the entire supply chain.
The pharmacy spam rings have allegedly sent hundreds of millions of e-mail messages to Microsoft's MSN Hotmail customers within the past year alone, Microsoft said.
In August, Pfizer took legal action against 30 websites claiming to sell Viagra or generic versions of the drug, even though there is no legal generic Viagra. The company said 29 of those site are no longer operating.