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ASP issues with Exchange 2007 on Windows Server 2003 64 bit.

I have been setting up Exchange Server 2007 for a client this weekend. Everything has been proceeding fairly smoothly, until I tried to test out Outlook Web Access. When going to the server from my browser, I would receive a “Service Unavailable” message.

Event Log gave much more information, thankfully:

Event Type: Error
Event Source: W3SVC-WP
Event Category: None
Event ID: 2274
Date: 3/2/2008
Time: 3:18:41 PM
User: N/A
Computer: xxxxxxxxxx
ISAPI Filter ‘c:WINDOWSMicrosoft.NETFrameworkv2.0.50727aspnet_filter.dll’ could not be loaded due to a configuration problem. The current configuration only supports loading images built for a AMD64 processor architecture. The data field contains the error number. To learn more about this issue, including how to troubleshooting this kind of processor architecture mismatch error, see

The link didn’t help at all. Searching for “W3SVC-WP 2274” on Microsoft’s support site also didn’t help. Thankfully, Google saves the day.

The fix is quite simple. Follow the directions in this link and OWA should start to work properly again.

Update:  This is a known issue when Blackberry Enterprise Server is installed on the same box.  See this link.

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