This happened on 3 servers after exchange 2010 sp1 update rollup 7. When you go to use OWA it just redirects to a white screen with a long url that ends in &reason=0.   Go to start, admin tools,...

Problem: When trying to access OWA it does not load, and eventually will show an error stating a base theme couldn’t found. Solution: All of the OWA themes are located in the following directory C:\Program...