Of course if Windows isn't your cup of tea, then you can also install Microsoft's DOS on your Mac using Virtual PC.

FORBES: Magazine Article

Windows Me will be Microsoft's last operating system based on its 20-year-old DOS programming technology.

CNN: Microsoft launches new consumer Windows program

Companies like Microsoft (DOS) and RIM (BB) have made their money on one product which they try and stretch out over the length of the cycle.

FORBES: Apple, Google, Microsoft, RIM -- Buy 'Em All!