Today marks another important date in the development phase of Microsoft's much anticipated Windows 7 operating system. Post
signing the RTM (release-to-manufacturing) for Windows 7, the software is now officially available to MSDN and Technet subscribers. The English (En-US) version is available starting today, while the International versions will be available weeks later, on October 1.
It was further added that starting tomorrow, companies that are Microsoft Software Assurance license holders, will be able to download Windows 7 RTM (En-US) through the volume-licensing service center (VLSC). International versions will be available later. SA license holders will further be able to purchase Windows 7 through Volume Licensing on September 1st, as
announced earlier.
Source: Windows 7 Team Blog