When you press ‘options’ in Outlook Web Acces (owa) you get:
404 – File or directory not found.
The resource you are looking for might have been removed, had its name changed, or is temporarily unavailable.
To resolve this issue do the following:
1. On the exchange server go to: IIS – Default Web Site – ecp/owa
2. Click on HTTP Redirect
3. Uncheck ‘Redirect request to this destination’
4. Restart IIS Admin service
Test it. =)