Internet Explorer 11 : Can’t load OWA Premium

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Posted on January 03, 2014

When you try to access Outlook Web App (OWA) Premium by using Internet Explorer 11 in a Microsoft Exchange Server 2013, Microsoft Exchange Server 2010, Microsoft Exchange Server 2007, or Microsoft Exchange Server 2003 environment, OWA Light is loaded instead.

http://support.microsoft.com/kb/2866064