This example saves a copy of the active presentation under the name "New Format Copy.ppt." By default, this copy is saved in the format of a presentation in the current version of PowerPoint. The presentation is then saved as a PowerPoint 4.0 file named "Old Format Copy."
With Application.ActivePresentation
.SaveCopyAs "New Format Copy"
.SaveAs "Old Format Copy", ppSaveAsPowerPoint4
End With