"On Monday, September 24, Microsoft introduced the first fully-fledged Beta build of Windows Vista Service Pack 1 and almost immediately the release was leaked to peer-to-peer file sharing applications. Build 6001.16659 of Vista SP1 was preceded by the availability of two pre-beta versions of the service pack that received quite a lot of attention and one that almost managed to get by unnoticed. Windows Vista SP1 build 6001.16549.070628-1825, build 6.0.6001.16633 and build 6.0.6001.16655 were all pre-beta versions of the service pack. Because of the nature of the pre-beta, the build that preceded Vista SP1 Beta in terms of availability were dropped into the laps of a very exclusive pool of testers."
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