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Windows Vista previews set to expire

Users of pre-release versions of Vista will start to see notices on Tuesday that the operating system will expire on May 31.

Still using a preview version of Windows Vista? Be aware that the operating system will expire on May 31. If you want to keep using the operating system, Microsoft would like you to buy a copy.

The expiration affects participants in Microsoft's "Customer Preview Program" who are still using a pre-release version of Windows Vista Ultimate, Microsoft said in an e-mailed statement on Tuesday.

"However, we expect most beta users will have moved to a full version of Windows by this time," Microsoft said.

Those people still on early Vista releases will start to see notifications starting today (April 24). That should give ample time to back up data and migrate their PCs to the final version of Windows Vista, Microsoft said.