One of our clients had this problem while he was trying to reply to an email in outlook 2007. He got this paragraph symbol. Heres the steps to hide it ( this is as per office 2010, but options are similar for 2007 )
Click on New Message -> File -> Options -> Mail ( on the left ) -> Editor Options -> Display ( on the left ) -> uncheck the option “Paragraph marks”
Click on New Message -> File -> Options -> Mail ( on the left ) -> Editor Options -> Display ( on the left ) -> uncheck the option “Paragraph marks”
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| picture as in Outlook 2007 |