Windows 8 Pro: Microsoft allow the return to Windows 7 or Vista but not XP

This provision is contained in the license agreement OEM new operating system, as was already the case for the pro version of Windows 7.

Users who purchased a PC comes with Windows 8 Pro will be able to return to Windows 7 or Vista. This is what provides the license agreement which applies to manufacturers who integrate the operating system in their new computers. The option to "downgrade" does not apply to the consumer version of Windows 8 sold individually.

This option was already available with Windows 7 Pro to allow customers to return to Windows XP. But with Windows 8 Pro Microsoft OS oldest still active (42.52% share of usage) is no longer in the plan downgrade. We also recall that Office 2013 will not support Windows XP with support ceased in April 2014.