CNET News.com: Microsoft admits privacy problem, plans fix

“Microsoft has acknowledged that a feature of its Windows 98
operating system can be used to trace the identity of authors of
electronic documents, according to a report.”

“The company acknowledged that Windows 98, and other Microsoft
applications such as Word and Excel, generate unique identification
numbers that are linked to registered users’ names, according to a
report in the The New York Times.”

“The company said it will alter the way the registration process
works in the next maintenance release of Windows 98, according to
the report.”