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First launched in May of 1999 with an index of 80 Million documents, FAST Search has grown tremendously in a very short time, spidering 1.5 Billion documents. After reduction of duplicate pages, this provides for an index of over 575 Million high-quality unique documents.
Relative Size Showdown [notess.com]
Google do tend to exaggerate a little ;), their figure includes pages that they know about but have not spidered