IE Configuration Instructions for OWA
Type the IP address for the exchange server OWA http://64.44.33.10/exchange (outside) or http://192.168.1.20/exchange (inside). If you don't get the Username & Password prompt as shown above. you must configure your MS Internet Explorer. From an open IE session, click tools, internet Options. Click Security. Click Custom. Follow the settings as shown below and match your IE settings to the ones depicted. Click the Advanced tab and follow the same procedures. Retry the connection. You might have to close and reopen IE.