With Windows Vista finally behind us, it's time to turn our attention to the next Windows client release, which is currently codenamed Windows "7", though Microsoft has used other code-names, like "Vienna" and "Windows Seven" in the past Despite an almost complete lack of verifiable information about this next major Windows release, this is what is true and accurate.
Following is the extract of the details give by Kevin Kutz, a Director in the Windows Client group at Microsoft about Windows 7
Q: Is Microsoft working on an operating system after Windows Vista?
Kevin: Yes. The next client version of Windows was originally codenamed "Blackcomb," though the company renamed it to "Windows Vienna" in early 2006 and to "Windows Seven" or "Windows 7" more recently.
Q: Why Windows 7?
Kevin: Since Windows Vista is really Windows 6.0, Windows 7 will presumably be version 7.0.
Q: Is Windows 7 the final name?
Kevin: No. Like Vienna, Windows 7 is just a codename and will likely change prior to the OS' official release...