Exchange Server Protocol docs
You can find the Microsoft Exchange Server 2010 SP1 RTM Protocol technical documentation set provides detailed technical specifications for Microsoft protocols and extensions to industry-standards or other published protocols that are implemented and used in Microsoft Exchange Server 2010 SP1 RTM. This allows the user to interoperate or communicate natively with Microsoft Office client and other server products. You can download the documentation, which is designed to describe each protocol in detail as it is used by the Microsoft Exchange Server. Each protocol specification documents the technical requirements, limitations, dependencies, and Microsoft-specific protocol behavior. The documentation set includes a set of companion overview and reference documents that supplement the technical specifications with conceptual background, overviews of inter-protocol relationships and interactions, and technical reference information
Note: The protocol specifications are available in the Adobe Portable Document Format (PDF) for that you can use the Adobe Reader 8.0 or later @ http://www.adobe.com .