Services » Desktop Support » O/S Upgrade
Windows XP has reached the end of its support lifetime. If the hardware is capable, it is generally advisable to upgrade to Windows 7.
Despite market hyperbole, any computer system may be vulnerable. Beneath the glossy interface of MacOS lies the mach kernel, which is heavily based on BSD. Security vulnerabilities do arise in the kernel from time to time, and may not be addressed if you're using an outdated version.
With such a distributed developer community, security patches for various services and daemons are issued frequently. If your distribution of Linux becomes outdated enough it can become an enormous task to update. It's important to stay current with your Linux distribution.