We have MS Exchange 2010 with Outlook Web Access. IIS logging is enable. It works for everything like : /RPC/* /autodiscover/* ... And it works also for : /OWA /owa/auth/logon.aspx /owa/ev.owa ...
i created a copy of the system in a VMWare Virual Machine (v7), size is 7.11 Go compressed, 70 Go uncompressed (sorry system is in french !) log in: adminstrateur & password: T3st ...