https://technet.microsoft.com/en-us/library/mt473798(v=exchg.150).aspx
https://technet.microsoft.com/en-us/library/mt652109.aspx
https://technet.microsoft.com/en-us/library/bb124147(v=exchg.150).aspx
https://technet.microsoft.com/en-us/library/aa998033(v=exchg.160).aspx
