Well, when Apple becomes more popular and used than Windows it will be the target of hackers. The most popular kid on the block always wants to be taken down by others.
Wow. 130 post before someone brought out that old timeworn 'popularity' canard. I believe that is some kind of record. The size of the installed base has little, if anything to do with making a given system a target for atttack. Google the "witty worm" for more information about that. The fact is, MS-windows is a stinking virus magnet. No other currently used operating system even comes close to it in terms of vulnerabilities.
There are now over 32,000,000 Macs in use around the world. When will we reach the magic number that will result in ONE viable self-replicating, self-transmitting computer virus that infects OS X Macs? When will Macs attract the attention of your hackers???
Keep in mind that the Witty Worm was written to infect vulnerable computers using Black Ice firewalls six months AFTER a patch was distributed to fix the vulnerability. The total number of potential vulnerable computers was just around 10,000. Every single one of them was infected 45 minutes after the Witty Worm was released into the wild. Why hasn't anyone written a Witty Worm for OS X Macs? Could it be that the architecture of the OS is far more secure than is Windows?