We have SBS2003 with SP2 installed. The event log shows
Source: W3SVC-WP
Error: 2214
The HTTP Filter DLL D:\Program Files\Exchsrvr\exchweb\bin
\auth\owaa
uth.dll failed to load.
Followed by:
Source: W3SVC-WP
Error: 2268
Could not load all ISAPI filters for site/service. Therefore startup aborted.
I didn't see any updates recent enough to cause trouble, I did look up on Microsoft.com any updates that included the owaauth.dll and only found one, KB931978. We've uninstalled that. Same problem.
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