1.at the beginning of 2007, it was 15 and 17 inch MacBook Pro, and in 2009, it was launched 13 inch. At this stage, 15 and 17 inch coexist. 20 12 years 17 inches stopped production, leaving only 15 and 13 inches, until now.

2. In the early days, it was a common screen+mechanical hard disk+optical drive, which was cumbersome in appearance; 20 12 introduced retina screen +SSD+ optical drive, which is thinner.

The above two points are the most obvious changes. You can find more detailed changes yourself. Look at this website:

Macbook Pro/Macbook Air/IMAC/MacMini/MacPro model configuration list -20 15/0 1 update

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(Source: Weifeng Forum)