SBS 2003 OWA gives normal login screen but then gives a HTTP 500 error after login

This morning OWA and OMA were "not working". Re-ran the wizard for Internet and Email setup, unchecked the Require SSL and Enable Forms Based Authentication. Seemed to be working Ok from IE and iPhone. Now, they are both down again. Have spent considerable time looking through here for the appropriate answer and each time I think I have it fixed, one or the other stops working.

Any help would be greatly appreciated.

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SCSSpikeAuthor Commented:
To be a little more specific about what I am dealing with, here is a sample of the URL:
Original Link in IE:
After you click on the bookmark, the Address turns to this:
After you click Logon, it chages to this but with a HTTP500:
If I manually change that last address to:
then it lets me into the normal OWA page with all my mail and folders.
I know this has to be IIS related and possibly a DUH fix, but I can't find the issue.
Thanks for any help.
I seem to remember this from a few years back.
From a command prompt run the following
c:\windows\system32\regsvr32 scrrun.dll
Then after it registers, restart IIS with the command IISRESET

Now try to log in to OWA again.
SCSSpikeAuthor Commented:
The .dll registered successfully and I reset IIS but the HTTP500 error remains.
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Shreedhar EtteCommented:

Have you rebooted the server? If yes, got to

Else reboot the server first and check OWA.

Problem still persists then refer

Hope this helps,
SCSSpikeAuthor Commented:
Not sure why I read so many articles telling me to make sure that Forms Based Authentication was turned OFF, but I'm just glad it works now.
Thanks for all the help.

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