Ever get tired of looking up information via an RDP session to the server or on http://www.microsoft.com/technet/prodtechnol/exchange/e2k7help/ when it comes to Exchange Server 2007? Well how would you like your own personal copy fo the Exchange Server 2007 helpfile instead?
Grab the Exchhelp.chm from the Microsoft download center. It's a self extracting archive so you can unzip it to the location of your choice.
This file includes a weath of information including the Getting Started, Planning and Architecture, Deployment, Operations, Security and Protection, Technical Reference and Development sections.