328882 - Exchange Memory Use and the /3GB Switch
Apparently, it may actually run better with 1 Gig of RAM than it does with 3 Gigs, due to allocation issues. This originally came up because I was getting Event ID 9582.
And, indeed, here is the google thread that most succinctly describes this.
Posted by jshare at January 13, 2004 04:19 PM