I'm surprised that someone who likes Macs doesn't know how to write the word down. ;-)
We'll see how you like your monoculture Windows shop when a shiny new zero-day worm hits and destroys your data enterprise-wide. lol
Why people invest so much in the most insecure OS historically is a mystery. I hope you wrote your "proprietary" software portably so you can easily move it to a better OS when the cluebat hits.
I’ve been in this business for over twenty years and the closest we had to a zero day exploit was Code Red and MS fixed it in a day I recall.
So, ever hear of heartbleed? No device attached to the Internet is safe, has a Mac (satisfied how I spelled it, wouldn’t want to get tears in your MAC keyboard) every had an exploit and before you smugly answer no, yes it has.