CWmike writes "Microsoft has denied that it has built a backdoor into Windows 7, a concern that surfaced yesterday after a senior National Security Agency (NSA) official testified before Congress that the agency had worked on the operating system. 'Microsoft has not and will not put "backdoors" into Windows,' a company spokeswoman said, reacting to a Computerworld story Wednesday. On Monday, Richard Schaeffer, the NSA's information assurance director, told the Senate's Subcommittee on Terrorism and Homeland Security that the agency had partnered with the developer during the creation of Windows 7 'to enhance Microsoft's operating system security guide.' Thursday's categorical denial by Microsoft was accompanied by further explanation of exactly how the NSA participated in the making of Windows 7. 'The work being discussed here is purely in conjunction with our Security Compliance Management Toolkit,' said the spokeswoman. The company rolled out the Windows 7 version of the toolkit late last month, shortly after it officially launched the operating system."