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Running an old operating system? Then upgrading to a new version might give your system a spring clean and bring with it some new features for you to play with.
Upgrading Windows or Mac systems is pretty easy, and far less problematic than they once were. Macs are especially easy to upgrade because the process is essentially a one-click download from the Mac App Store.
Mac OS X upgrades are also cheap, costing only $20.
Windows upgrades cost more, but hardware support goes much further back, so there's a better chance that you can upgrade an older system to the latest version.
Anyone thinking of upgrading should check to see if his or her system can handle the upgrade before pulling the trigger on buying it. For Windows users Microsoft has an Upgrade Assistant, while Apple's offering is some simple instructions on checking your hardware.
Personally, unless the hardware is relatively new – no more than five years for a PC, and about three years for a Mac – I'd save my upgrade money and put it towards a new system, and the costs outweigh the benefits.