On May 18, pre-release versions of Windows Vista (Beta 2, RC1 or RC2) will begin prompting users with warning notifications about the upcoming expiration on May 31. It is therefore recommended to backup all data and move to a final version of Windows before the expiration date. Between June 1 and August 28, customers who continue to use pre-release versions of Windows Vista will be able to log in for 2-hour sessions to retrieve data. After 2 hours of use, the PC will automatically reboot without providing the opportunity to save data.
If the user would like to switch editions of Vista, the appropriate upgrade version must be purchased and a clean installation needs to be performed. Customer Preview Program participants will not be receiving discounts, other than the option to purchase upgrade versions of Windows Vista, as opposed to the full versions. As already noted previously, performing a roll back to Windows XP is not possible.
Link: Forum Discussion (Thanks Nidonocu)
News source: Windows Vista Team Blog
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