OWA: Exchange 2003 & Server 2000 - HTTP 500 - Internal server error

You will need to enable Forms Based Authentication in order to use the new
login page.

You do this by opening the Exchange System Manager, then navigate to
Protocols > HTTP, here you should right-click Exchange Virtual Server and
choose "Properties" > then click on the "Settings" tab.

Thanks Microtech, but I have already done that:
"When I try to enable forms based authentication, I get the nice logon-screen, but when I log on I'm immediately give a "HTTP 500 - Internal server error" for the "/exchweb/bin/auth/owaauth.dll" page."

I.e. I get the the 500 error after pressing the "Log on" button.

The problem seemed to be connected with the ISAPI filter - I removed it and added it again, and everything worked. The application pool was also wrong so I fixed that as well. Thanks!

well, that KB article fixed this exact issue with my Exchange server also, which leads me to wonder: WHY isn't this all configured in the first place? it seems utterly stupid to leave this kind of thing up to the administrator to figure out when MS has obviously put so much effort into writing the wizards to auto-configure the SBS setup in the first place.

i'll never get what development process they use at MS that leaves the end user with so much stuff to figure out on their own. THANK YOU to EE for making the job considerably easier!