The reasons why Windows Vista failed
Microsoft appears to have put Windows 7 on an accelerated schedule that could see it released in 2010. That will provide IT departments with all the justification they need to simply skip Vista and wait to eventually standardize on Windows 7 as the next OS for business.
The reasons why Windows Vista failed:
Windows XP is too entrenched.
Vista is too slow.
It broke too much stuff.
There wasn’t supposed to be a Vista.
Apple successfully demonized Vista.