<P> The product 's second iteration , known as the `` unibody '' model , has a casing made from a single piece of aluminum . It debuted in October 2008 in 13 - and 15 - inch screen sizes . In January 2009 , the 17 - inch model was updated with the same unibody design . Subsequent updates brought upgraded Intel Core i5 and i7 processors and introduced Intel 's Thunderbolt technology . </P>
when did macbook pro 13 inch come out
October 2008