"Today we became aware that incomplete portions of Windows 2000 and NT 4.0 source code was illegally made available on the Internet," said Microsoft spokesman Tom Pilla. "It's illegal for third parties to post Microsoft source code and we take that activity very seriously," reports The Washington Post.
"There was no indication that the code was stolen through a breach of Microsoft's internal network, Pilla said. He said the FBI is investigating the matter."