“Microsoft has not and will not put ‘backdoors’ into Windows,” a company spokeswoman said, reacting to a story that it has built a backdoor into Windows 7, a concern that surfaced after a senior National Security Agency (NSA) official testified before Congress that agency had worked on operating system. Microsoft’s categorical denial was accompanied by explanation of exactly how NSA participated in making of Windows 7. “The work being discussed here’s purely in conjunction with our Security Compliance Management Toolkit, rolled out shortly after Windows 7 launch,” said spokeswoman. Microsoft’s rejection of that it’s hidden a backdoor in Windows came as no surprise to security researchers, who expressed doubt that the company would put its reputation at such risk. “I can’t imagine NSA and Microsoft would do anything deliberate, because repercussions would be enormous if they got caught,” Roger Thompson, chief research officer of AVG Technologies, said.