"A hands-on preview of the latest operating system coming to Macs: OS X Mavericks. The next version of OS X adds power, flexibility, and features to the existing version, OS X Mountain Lion, but if you upgrade from the most current version, you won't notice much of a difference at first glance."
A quick patch update to Windows can extend the useful life of a PC. To take the fear out of Upgrading Windows 98 to Windows XP, rely on this guide. - PCSTATS Tips