It will show the maximum version of OS X you can install, and from what I could see chances are you can go to 10.11 (El Capitan). Go to this web page, select your specific Mac model from this list, click on the associated link, and then look form "Pre-Installed Mac OS". Airport Utility 5.6 will NOT run on El Capitan (while I do not use them any longer, I've owned most of the various Flying Saucer generations of Airport Extreme, including the very first one with the built-in phone modem that would automatically dial-up my ISP). You will loose access to the Flying Saucer Airport Extreme. All of these "old" features and various others are there to preserve business history files that I cannot afford to lose. and Airport Utility which is currently matched to the original "flying saucer" Airport Extreme. I can live without those features, but of special concern are the Disk Utility, into which I have placed many password-protected files QuickTime Player, which in my version is "pro" upgraded to include various adjustments for color, playback speed, etc. In both computers, there are many features related to mobile devices that won't apply. It also looks like I might be able to update my MacBook Pro still running Snow Leopard 10.6.8, but the model identifier says "MacBookPro5,1" which doesn't specify the year.
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