We have a client who has had Exchange 5.5 (service pack 4) installed on a BDC running Windows NT 4.0 (service pack 6) for a few years. Recently they have asked to start using the OWA (outlook web access) portion of Exchange so that their employees may check and respond to e-mail, check calendars, view contacts, etc. from home or while they're on the road. We have set OWA up so that the IIS on the PDC sees the virtual directory on the BDC where Exchange is located. At this point, we are able to log on to each employee's individual mailbox from off site, view the calendar, see the contacts, see the list of e-mails in the inbox, sent mail, etc....we're even able to send e-mail from their accounts through the OWA access. However, when you click on an e-mail to view it, we get a pop-up window (that would normally have the text of the e-mail in it) that reads, "HTTP 404 Not Found" (on the header) and "The page cannot be found The page you are looking for might have been removed, had its name changed, or is temporarily unavailable." (in the body). I have searched the net and through the MS Knowledgebase for the past week but have not found anything that would correct this. HELP!