I used to support Maya back in the day and the orientation of the software is Y up. For some of our other software packages, the orientation is Z up. During my morning coffee run, the conversation came up with with one of our Maya Developers [Julia P.] and she told me why and it totally makes sense....
If you are an Artist, the image will be on an easel, therefore, Y is up.
If you are an Engineer, you are working on a drafting table so Z is up.
Here are some screen captures of our software packages and their X,Y,Z orientation.
A bit of luck and a bit of googling, I confirmed it. Just double click AutoCAD while holding the shift key and AutoCAD for Mac will reset to default. This feature started in AutoCAD 2014 for Mac SP1 and it is noted in the Read Me. I hope you enjoy my second infographic.
Thanks to Hansel Diaz for confirming that this works and for sharing it with the community.