High Physical Memory Utilization

One of my colleagues recently reinstalled a 5.5 SP4 Exchange Server on NT4 SP5 (only Exchange was reinstalled) and have noticed that the PhysicalMemory Utilization sits at around 99% (prior to the rebuild it was around 60%).  The server has about 400 mailboxes on it and has 1Gb of physicalm

RE: High Physical Memory Utilization

So that begs the question before the rebuild why was it running at 60%? No hardware change Does anyone know where I can find the Performance Optimizer Settings? Is it a registry key or what? 34 answers and no one with any real ideas. Did I ask a stupid question? -Original Message-