Event ID - 19

Event Id19
DescriptionThe HTTP server was unable to load the ISAPI application c:\exchsrvr\webdata\exupload.dll. The data is the error.
Event InformationAccording to Microsoft: This error is caused by registry restrictions that prevent guest access; it occurs when OWA is using Internet Explorer 5. This error occurs if the following registry key is enabled with a value of 1: "HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Eventlog\Application\RestrictGuestAccess".
RESOLUTION: A supported fix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Apply it only to computers that are experiencing this specific problem. This fix may receive additional testing. Therefore, if you are not severely affected by this problem, Microsoft recommends that you wait for the next Internet Explorer 5 service pack that contains this fix.
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