This is the 1st time I'm dealing with server. May I know what does it mean by "Exchange Server 2010 does not include WebDAV"? Does this mean that EWS does not use HTTPWebRequest and HTTPWebResponse anymore or does not communicates by using the same ports that HTTP and HTTPS? Is it some setting done at the server side that disable the use of WebDav? When it said does not include WebDAV, what does it actually mean? If i really want to use WebDav in Exchange Server 2010, is it possible? Yes, EWS is way better compared to WebDav but what if I wish to use WebDav.