Protocol Docs RTM

That's right - version 1.0 of the Exchange Server Protocol Documentation has been published in the MSDN:

https://msdn.microsoft.com/en-us/library/cc307725(EXCHG.80).aspx

Here's the press release:

https://www.microsoft.com/presspass/press/2008/jun08/06-30InteropUpdatePR.mspx?rss_fdn=Press%20Releases

And the page with links to all the licenses if you want to make use of the documentation:

https://www.microsoft.com/about/legal/intellectualproperty/protocols/default.mspx

As noted before, support for this documentation is conducted through the forums. Enjoy