The Navigation pane, which replaces the old Document Map from previous versions, sits along the left side of the document (if you choose to make it visible), and shows one of three views, selectable via tabs at the top of the pane.

Please consult the following links to see what is new in Word 2010 and general Word 2010 support:

http://office.microsoft.com/en-us/word-help/redir/HA101631587.aspx
http://office2010.microsoft.com/en-us/support/getting-started-with-office-2010-FX101822272.aspx#

For more information, contact the IT Support Center Help Desk at 713-743-1411, email support@uh.edu, or visit the IT Support Center in room 58 MD Anderson Library (in the basement). In addition, please consult the UH Get Help system, located at http://www.uh.edu/gethelp/ for answers to common inquiries.