Good insight into the support and patching methodology for Exchange 2007

Product service strategy for Exchange Server 2007

A good read if you are interested in Exchange 2007 support.

A brief summary of what the KB article contains:

The way that we service Exchange 2007 differs from the way that we service earlier versions of Exchange.
This new service method offers many advantages over earlier methods.

This method differs from earlier methods with regard to the following:
1. Update contents
2. Installer technology
3. Fixes that are included

This article describes these differences.
Additionally, this article contains information about how you can best deploy updates for Exchange 2007.