Vista has been delayed by a week because of a bug, according to reports.
The oft-delayed operating system was due for release to manufacturers yesterday, 25 October, but this has been pushed back to 8 November because of a bug serious enough to require a complete re-install of the software.
Cunning Microsoft, fed up with constant complaints about delays, has not made public exactly when the release date is - and without an official release date it can't be delayed.
A statement from Microsoft said: "We have not announced our final plans for launch of Windows Vista and Office 2007. However, we are on track for business availability in November and general availability in January, although the exact dates are determined based on the product quality."