Windows 7 Upgrade Path
Microsoft has released information on the upgrade path to Windows 7. XP will have no direct upgrade path and requires a hard drive wipe and installation of Windows 7. Some versions of Vista may be upgraded directly.

Windows Upgrade Chart
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I am extremely disappointed with microsoft’s products. I purchased windows 7 to upgrade my vista o/s which didn’t work with anything. I have been unable to back up any of my files to my external hard drive. Since there was nothing about upgrade paths on the packaging, I purchased windows 7 professional. It won’t install on my Vista Home computer. I can’t do custom and lose everything. I want a refund.