How can I obtain access to mil email from personal MAC PC?

I use Mac and once I set it up by following on the online step by step guide (proper CAC reader, downloaded files, keys, etc) never really had an issue with it. Every once in a while you had to clean out the files in the key and reload them.

Step Number One, shot down your Mac.
Step Number Two, get by a computer that runs on windows.
Step Number Three, use your windows computer.

I have know many that have had this issue. Apple is not friendly with military systems. Most either bring home a work computer or they can't check it at home.