MessageStats helps you better understand how your Outlook Web App environment is being used. Gather information and report on OWA servers and users. Reports include:
Log on reports provide information about the quantity and success rate for OWA log ons at the organizational level, as well as one or more specific servers. Determine the peak times for OWA activity to help improve OWA service and determine out-of-service periods, Denial of Service (DoS) attacks, or even attempts to guess a password.
Usage reports provide information about the distribution of OWA log ons by account, mailbox, server, site/ administrative group, routing group, department, virtual directory/ web site and Internet browser and version.
OWA server uptime report identifies which OWA servers and associated services were available and running on the network for a full day.