Microsoft has stated that it is "scoping Windows 7 development to a three-year timeframe", and that "the specific release date will ultimately be determined by meeting the quality bar."
Windows 7 will ship in both client and server versions with the client versions available in both 32-bit and 64-bit editions. The server version of Windows 7, Windows Server 2008 R2 , is 64-bit only.
Although for a long period of time Microsoft maintained a "translucency" policy (rather than a "transparency" policy) in the lead up to the PDC, or Professional Developer's Conference, the Windows 7 project, features and technologies are slowly being revealed. Public presentations from company officials have disseminated information about some features and leaked information from people to whom the Milestone builds (M1, M2 and M3) of Windows 7 were provided also provides some insight into the feature set.