Gary Sweeting listed a whole bunch of information resources on Microsoft Exchange 2007 and Compliance check his blog for the details:
… The compliance features that we provide in Exchange Server 2007 is something that many of our customers are excited to see – the transport rules wizard make it so easy to create organisation wide rules that there’s no excuse for every company not to implement policies to safeguard their information, employees and ultimately their company. I’ve been meaning to create a listing of all the compliance resources, seeing that Paul Robichaux had some difficulty finding some resources, I decided to get this out the door in case others are in the same situation. …