On Tuesday, Microsoft privately alerted Whistler testers that it is making substantial changes to the look and feel of the desktop versions of Whistler, according to tester reports. But Microsoft is taking unusually high security precautions to make sure that testers, the press and the public don´t get to see the interface changes before the product--the successor to Windows 2000--goes to Beta 2, which is expected to occur the week of Feb. 12.

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