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#21
He didn't in-place Upgrade, he clean installed 7 Professional over Vista Home Premium.
Having any version of XP or Vista qualifies one for using Upgrade version.
The chart shows only in-place Upgrade paths Vista>7.
Since Vista was on a drive during install, a flag was passed allowing use of Upgrade version key so he can insert it at any time in the future without doing one of the workarounds.