Sub Copier_Feuille()
Dim i As Integer, t
Sheets("MAI 2016").Activate
Application.ScreenUpdating = False
For i = 1 To 12
ActiveSheet.Copy After:=Sheets(Sheets.Count)
t = Timer + 1: Do Until Timer > t: DoEvents: Loop
ActiveSheet.Name = "MAI 2016" & " - " & i
ActiveWindow.View = xlPageLayoutView
Next i
End Sub