If you snoop around the Outlook folders on your hard drive (%USERPROFILE%\Application Data\Microsoft\Outlook and %USERPROFILE%\AppData\Roaming\Microsoft\Outlook) you may see two new files - outlook.sharing.xml.obi and Outlook.xml.kfl.
Outlook 2007 creates these files - the <profilename>.sharing.xml.obi file contains RSS subscription names. The <profilename>.xml.kfl file contains the Known Feed List for RSS which is shared with IE. If you aren't sharing your RSS feeds, you may not have the KFL file.
Published May 19, 2009. Last reviewed on June 4, 2014.