Creating a New Folder in the Current Drawer

  Choose Create Folder...  from the Drawer pop-up menu to
  create a folder in the drawer on which MB3 is positioned.

  A dialog box is displayed in which you specify the name of
  the folder to be created.  A folder name can contain up to 39
  characters; it must begin with a letter or number; and it can
  contain letters, numbers, underscores, hyphens, dollar signs,
  spaces, and periods.

  Additional topics:

  *   Drawer Pop-Up Menu

  *   Overview of Mail