I am currently looking into starting up a hosting company and I want an actual server in my possession. I am looking into the Apple X server But I know alot of people still do not use macs. Would it matter that this is running Mac OSX on it while most of my users are running vista or xp based machines.
Well, most people dont use Mac or Windows OS for their hosting comapny servers. What people generally do is lease dedicated boxes from providers, load Linux (CentOS preferred) and a decent control panel. BTW, I got your PM...what I get from the PM and this topic is that you have very little knowledge about the things in servers and hosting. "Little knowledge is dangerous" they say...opening a hosting co. take a few hours but most fail within a month. Do you want to join them or be successful? To succeed, first learn about the things, hang around at different hosting discussion groups, learn to administer servers a bit then think of starting a hosting company.
If you like OS/X maybe you could approach it from the angle of FreeBSD/Apache since they are allegedly close relatives. Having said that, if you are inexperienced maybe you could acquire a vps running the above and run through the entire configuration, setup, recovery, emergency processes a few times to see if you have what it takes on the technical side. Then the acid test, put up a site and see if you can actually get buying traffic to that site. Perhaps become an affiliate, so that you don't actually waste the traffic. If you can't get the traffic, then you'll know to stop before spending any more money.
It does not really matter what platform your client use, however, focus on browsers. There are a bunch of differences between IE/FF/Safari.