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When you try to browse OWA on SBS 2008, you may receive the following error message:
Outlook Web Access did not initialize. An event has been logged so that the system administrator can resolve the issue. Please contact technical support for your organization.
Failed to remove unnecessary privileges, GetLastError()=5
This issue may occur if the 'Physical Path Credentials' attribute on the Advanced Settings of OWA virtual directory is using a specific user account. This means only that specific user account has access to the physical path for the OWA virtual directory.
You should always use the 'Application User (pass-through authentication)'. With this option, IIS uses the credentials of the requesting user to access the physical path.
Open Internet Information Services (IIS) Manager.
Expand the SBS Web Applications site.
Click the OWA virtual directory.
Click Advanced Settings.
Edit the entry for Physical Path Credentials and set it to Application User (pass-through authentication).
If you look in the Application Logs, you would see the following errors are recorded.
Log Name : Application Source : MSExchange OWA Event ID : 58 Description : Outlook Web Access could not load and is now restarting.
Log Name : Application Source : MSExchange Common Event ID : 579 Description : Removal of privileges from process "c:\windows\system32\inetsrv\w3wp.exe" (PID=7368, LABEL=MSExchangeOWAAppPool) failed with error code 0x80070005.
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