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.

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There are a number of the early Chromebooks from Samsung and Acer from 2011 are still functioning normally today (as of March 2014). They also are able to run the latest version of Chrome OS. So, barring the hardware breaking down or the OS maturing beyond the hardware, it can continue to run indefinitely.