Downgrade rights for Windows 7 are an end-user right, documented in the Software License Terms that customers accept upon first running Windows software.
Note that Windows 7 end user downgrade rights will be available for approximately 18 months after the general availability of Windows 7 (April, 2011) or the release of a Windows 7 Service Pack, whichever is earlier.
Follow these steps to downgrade to a previous version of Windows:
Only certain OEM versions of Windows 7 include downgrade rights:
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Downgrade rights for Windows Vista are an end-user right, documented in the End User Software License Terms that customers accept upon first running Windows software.
Only certain OEM versions of Windows Vista include downgrade rights.
Other OEM Windows Vista versions (for instance, Windows Vista Home Basic and Windows Vista Home Premium) do not include downgrade rights.
Downgrade rights are an end-user right, documented in the End User Software License Terms that customers accept upon first running Windows software.
Follow these steps to downgrade to a previous version of Windows server software:
Only certain OEM versions of Windows Server include downgrade rights. See below for the eligible versions.