Microsoft has not yet formalized, but the upgrade to Windows 8 from Windows XP, Vista and 7 contain some exceptions that will be better known.
Users of Windows 7 Starter, Windows 7 Home Basic and Windows 7 Home Premium will switch to Windows in maintaining both their settings, their applications and personal data.
-Users of any version listed above as well as those with Windows 7 Pro and Windows 7 Ultimate can spend on Windows Pro 8 retaining their settings, their applications and personal data.
-Users of Windows 7 Professional and Windows 7 Enterprise will pass on Windows 8 Enterprise (available in volume licensing) under the same conditions.
-For Windows Vista users who have installed Service Pack 1 on Windows 8 will spend keeping their data and settings.However if they have not installed the SP1, only their personal data will be kept.
-For Windows XP, it must have the SP3 upgrade to Windows 8, but only the personal data will be kept.
However, it will be impossible to perform an update between Windows versions in different languages ​retaining any information except through the setup of Windows 8 for backing up personal data. Updates between two architectures (32-64 bit) will be impossible.
