My fellow MVP’er, Oliver Sommer, posted on his blog site yesterday (6-25-2014) that Microsoft quietly resolved an outstanding issue (KB 2866064) with Internet Explorer 11 and Outlook Web Access (OWA), where it would only display the “lite” version of OWA instead of the full “premium” version.
The fix is included in the following rollups:
Exchange 2007 Service Pack 3 Rollup 13