Moving the Current Message

  Clicking on the Move button in a Read window lets you move
  the currently displayed message to another folder.

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

  Click on the OK button to move the message.

  When you move a message, the message is marked for
  moving but is not actually moved until the folder is closed.

  While the folder remains open, you can reverse the operation
  with the Undo Move/Delete menu item on the pop-up menu.

  After the folder is closed the message is moved.  The message
  can be retrieved only from its new folder.

  Additional topics:

  *   Overview of Mail