A family of Microsoft word processing software products for creating web, email, and print documents.
You may have accidentally turned on a border in one paragraph and now it is carrying on in each new para you create after it.
Home tab / Paragraph group / Border Drop down. If the cursor is in one of the affected paragraphs, the background of the icon will be orangish.
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http://office.microsoft.com/en-us/outlook-help/learn-where-menu-and-toolbar-commands-are-in-office-2010-HA101794130.aspx - Silverlight applets Mapping 2003 menu to 2010 ribbon for all Office apps.
http://office.microsoft.com/en-us/training/HA102295841033.aspx -Flash Applets mapping Office 2003 menus to 2007 ribbon.