OWA Premium not accessible from IE 11

When users of IE 11 access the login page for owa.mit.edu, they may find that the option to log in using "light" mode is enabled and cannot be disabled. Until Service Pack 3 is deployed on MIT's Exchange servers, the workaround describe in this Microsoft KB article has been tested and found to work:

Note that in IE 11 this workaround forces IE to load all *.mit.edu web pages in Compatibility Mode (not just owa.mit.edu). Some mit.edu webpages that have not been tested in Compatibility Mode may display unexpected behavior as a result.