Microsoft Corp.'s long- awaited release of the upgrade to its flagship Windows operating system will likely be delayed again by at least three months, research group Gartner Inc. said Tuesday.The research note, released to clients on Monday, said the new Windows Vista operating system is too complex to be able to meet Microsoft's targeted November release for volume license customers and January launch for retail consumers.

Gartner said Windows XP took five months to go from a second test release to the start of production, but the magnitude of technological improvement in Vista is closer to Windows 2000, which took 16 months between the second test and production.

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Prashanth Rai