To browse the Exchange SDK documentation online, visit the Exchange Developer Center at http://msdn.microsoft.com/exchange. To download the SDKs and tools, visit the Exchange downloads list page at: http://msdn.microsoft.com/library/default.asp?url=/downloads/list/exchange.asp
Included in these releases are tasks for enumerating message attachments using WebDAV, and documentation for the Exchaneg 2000 Sample Gateway, as well as numerous bug fixes and clarifications. For more information, see the “What's New“ topic in each version's SDK:
The SDK team welcomes your comments about the Exchange Software Development Kits, they can be reached at email@example.com. Every time I get a development related question via this blog or my own that I can't answer, I send them to exsdkfb and they are great about responding with useful information and pointers.