You can deny HTTP protocol per mailbox in exchange 2000 under the exchange advanced tab > protocol settings. in exchange 2003 its a similar but under the tab Exchange features, you will need to switch on advanced view in AD though to see this.
Maybe possible to change security in IIS for the Exchange Web site
Last Wiki Answer Submitted: July 27, 2005 3:59 am by Coch20050 pts.
If you live outside the United States, by submitting your email address you consent to having your personal data transferred to and processed in the United States.
In AD you can allow or deny people access OWA under the users properties>exchange features.