We had Exchange 5.5 (standard edition)with SP3 along with NT SP5.<br>I installed IIS from Option Pack on the same server. Then the OWA from setup program, then installed SP3 for Exchange. <br>when I type the URL I get the OWA logon screen but keep getting "The Exchange Server is down or the HTTP service has been disabled by an Administrator. I check all the possible causes for this error message from Microsoft knowledge base. Is it possible that the lack of reinstalling SP5 is doing this. Also, when I attempted in install SP3 for Exchange it could not start thr Exchange Event serive due to a logon error. Still can't start it manually. THis crap worked fine at home.