No.
If you install Windows XP or Vista using Boot Camp, yes. You cannot play them in Mac OS X unless you purchase the Mac version.
Not likely. Only if it says PC + Mac on the box can you use it on both. There are quite a few games that do have this, such as Spore, but I don't like your chances.
A lot of games have mac versions of their games, for example all of the sims games have mac versions... but if the game you're trying to play is not a mac version you can't play it on a mac unless you install vmware fusion or paralells, both of which allow you to install windows on a mac sorry that I could be more help CrossOver Games is software that will allow some Windows games to be played on a Mac without running Windows but it does not work for all games. (See links below)
Yes, you can install The Sims Deluxe Edition on a Mac it is the Mac version of the game. If it is the PC version, it won't work on a Mac. You install it by putting the CD into the disk drive, in which autorun will automatically start the process for you without you having to do anything. Then follow the onscreen instructions to guide you through the installation process.
Yes. Windows version of itunes will recognize the soundfiles in your mac iTunes library.
Yes you can install Sims 3 on a PC or a Mac.
You only choice is limited to virtual machines such as VMWare. And of course you will have to install MAC OS on your virtual machine.
You will need to purchase the Mac version of the sims 2. You can buy them from the apple webisite: http://www.apple.com Go to the store and search for the sims 2. Hope this helps!
No, you can't. You can probably find a mac version of the same game though or install Windows on your Mac.
Either install Windows on Mac (yes, it can be done), or get the Mac version of Excel (yes, it exists).
No, i don't think so. It is coming out on mac but also windows and the mac version is also compatible with Linux (?) computers hope i helped x
No, sure won't. You need a Mac key for a Mac version and a Windows key for a Windows version. Programming between Mac and Windows is different.