I'm new to AutoCad for MAC but not new to AutoCad.  I teach AutoCad at a local Community College where they are using Windows machines. I have recently migrated to a MAC for my personal use.  I loaded AutoCad 2015 for MAC on my computer recently and was surprised at how much different it looks than AutoCad 2013 for Windows.

I guess my question is: Has the MAC version of AutoCad always been that much different or is 2015 a major revision?

Can anyone help?  Thanks.