Update: Microsoft Exchange Server 2007 Shell Help
The Microsoft Exchange Server 2007 Exchange Management Shell Help file helps you use cmdlets in the Exchange Management Shell to perform day-to-day administration of Exchange 2007. You can view help in the Exchange Management Shell by using the Get-Help cmdlet.
Get it here: http://www.microsoft.com/downloads/details.aspx?FamilyId=65C12B39-DBCA-4B22-BAA4-5F5D96613574&displaylang=en