The September 11 updates to Office 2013 caused the Folder Pane in Outlook to disappear. Use the link below to find out how to repair the issue.
http://blogs.technet.com/b/office_sustained_engineering/archive/2013/09/11/outlook-folder-pane-disappears-after-installing-september-2013-public-update.aspx?Redirected=true
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