Can the zoom function on Magic Mouse be used on all program's including email

I am looking to purchase a mac book air or pro, I have an vision condition so need ability to zoom in and enlarge text etc.
What functions do the pro and air book offer
I have seen the Magic Mouse you can press CTRL and zoom, this option is very useful, but does it work whatever program you are in.
Can you enlarge text in emails quickly to view more easily
Regards
Ian

Mac

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