Exchange 2007 webdav properties not being returned

Have an exchange 2007 server with webdav enabled. External 3rd party accessing the calendar. When they run their application it is getting these values returned to it
I need to enable more values to be returned to their application
    [0]: {[DAV:contentclass, DAV:contentclass]}
    [1]: {[DAV:getcontenttype, DAV:getcontenttype]}
    [2]: {[DAV:resourcetype, DAV:resourcetype]}
    [3]: {[DAV:creationdate, DAV:creationdate]}
    [4]: {[DAV:ishidden, DAV:ishidden]}
    [5]: {[DAV:parentname, DAV:parentname]}
    [6]: {[DAV:getcontentlength, DAV:getcontentlength]}
    [7]: {[DAV:isstructureddocument, DAV:isstructureddocument]}
    [8]: {[http://schemas.microsoft.com/repl/repl-uid, http://schemas.microsoft.com/repl/repl-uid]}
    [9]: {[DAV:displayname, DAV:displayname]}
    [10]: {[DAV:href, DAV:href]}
    [11]: {[DAV:isreadonly, DAV:isreadonly]}
    [12]: {[DAV:getlastmodified, DAV:getlastmodified]}
    [13]: {[DAV:iscollection, DAV:iscollection]}
    [14]: {[http://schemas.microsoft.com/repl/resourcetag, http://schemas.microsoft.com/repl/resourcetag]}