No ā It is not possible to run IIS6 and IIS7 on the same computer.
The IIS version for the machine is dictated by the operating system and cannot be installed separately.
For example, Windows XP ships with IIS5.1, Windows 2003 comes with IIS 6.0, Windows 2008 comes with IIS7.0, and Windows 2008 R2 comes with IIS7.5.
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