goober
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Businesses don't really have an incentive to switch over to Windows 7 if they want to keep there old hardware. There are lots of businesses that upgrade their systems after five, six, seven, etc. years. The systems that we have (old Pentium 4s with integrated graphics) would probably have problems with Vista Business out of the box. There's also OS validation which can be quite a bit of work for larger organizations.
It is likely that upgrades would result in the holy grail of computer companies and component suppliers: the hardware upgrade cycle. New computers with new operating systems are purchased resulting in lots of money flowing to Intel, Dell, nVidia, AMD, Lenovo, Sony, etc. Will it happen with Windows 7? I don't know. The economy is pretty lousy and companies are pretty stingy. I don't plan to upgrade my Vista systems. The desktop is fine and I can live with my slow laptop - it's just a backup machine for my MacBook Pro.
Yes I certainly didn't mean to imply that everybody in business is going to windows 7. Those that have systems capable or are planning on upgrading soon anyways will have basically little incentive to upgrade Vista when Windows 7 is around the corner.
Where I work they are using XP pro and will probably do so for at least the next 3 years or so.