Moving the Current Message

  Choose Move...  from the Message pop-up menu to move the
  current message to a different folder.

  Mail displays a dialog box in which you enter the name of
  the destination drawer and folder.  If a folder was selected,
  the names of the folder and the drawer in which it resides
  appear in their respective text entry boxes in the dialog box.

  The index indicates that the message has been moved.  The
  message is displayed in the index in its new location when the
  current folder is closed and the new folder is opened.

  Additional topics:

  *   Overview of Mail