According to Microsoft's latest "Windows Platform News" newsletter (2004 - Issue 53), RSS (Really Simple Sindication) stands for "Remote Storage Services":

Scopeware Vision
Can't find stuff on your computer? Scopeware Vision is a powerful new visual search utility that catalogs your files and Outlook e-mail and allows you to perform full content searches in order to find everything you need quickly and painlessly. Now with Remote Storage Service (RSS) support for access to web-based news feeds.

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