Check http://msdn.microsoft.com/library/default.asp?url=/library/en-us/wss/wss/_esdk_arch_prog_tech.asp.

>Can anyone point me to a specific web site ( an MS site I suppose, or any other ) that describes the requirements and procedures for writing an application that will run directly on an Exchange server for accessing and processing e-mail directly on the Exchange data store?
>
>Thanks,
>Bill