You mean the Favorite Folders box in Mail view? You can't. But you can
switch to Folder List view and have an experience closer to Outlook 2002.
Just click the Folder List button in the Navigation Pane.
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Patricia Cardoza
Outlook MVP
Author - Special Edition Using Microsoft Office Outlook 2003
Lead Author - Access 2003 VBA Programmer's Reference
Author - Absolute Beginner's Guide to Microsoft OneNote 2003