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Vista info. Microsoft is disbanding Vista and will be offering Windows 7 soon.
If you believe that, you probably believe in fairies too

That would be extremely costly for MS and effectively admitting that Vista was/is a failure, something which I doubt they would do.
The talk I have heard for the next version is 2010 in some newsletters, but even that isn't confirmed. Which will probably be good for me as I can't see me switching from XP Pro as it does everything that I need of it and its support life cycle is beyond that.