Quoting PanAm_DC10 (Reply 4): IIRC that was when the RFP was announced but perhaps 9MMAR or Flying-Tiger can clarify for us.
It was at least a MoU signed in Paris, IMO it was already a firm order with board approval attached:
Quote: Rome, 25 June 2007
ATR disclosed today the decision by Malaysia Airlines (MAS) to acquire a fleet of 10 ATR 72-500s plus options for 10 additional aircraft. The contract, valued at US $ 183 million, has been inked in the presence of His Excellence Abdullah Badawi, Prime Minister of Malaysia, and Romano Prodi, the Italian Prime Minister.