Both Mac OS X and Windows are popular operating systems. They are popular because people like using them.
Windows or Mac OS X depending on personal preferences and how you define popular.
Mac-OS=Disk operating system==Linux OS==Windows OS==Unix OS=
The most popular operating systems that can be uses on a MacBook include: Mac OS X 10.4 (Tiger), Mac OS X 10.5 (Leopard), Mac OS X 10.6 (Snow Leopard - due soon), Windows XP, Windows Vista, Windows 7, and several varieties of Linux.
Windows Vista and Mac OS are types of computer operating systems.
No , you cannot run OS X on a windows machine. Buy a mac
Windows XP is an example of an OS. Windows Vista is an example of an OS. Windows 7 is an example of an OS. Mac OS X is an example of an OS.
"Yes, you can run a Windows OS on a Mac notebook with the right software. There are programs such as Bootcamp that allow you to create a partition and install Windows OS."
A desktop uses the same OS as any other computer, Windows, Mac OS, or Linux. Also, I'd recommend Mac OS X if you're getting a new computer. Here's the scoop: if the computer has an  on it, it runs Mac OS. If not, it runs Windows or Linux.
Windows Vista and Mac OS X are examples of computer operating systems.
Pretty much the only reason Windows is related to Mac OS is that they are both operating systems.
After Mac OS. Mac OS was based on the earlier Xerox Alto system.
Free: the Linux OS Paid: Mac OS X snow Leopard