While many Windows users are content to live with older versions of their software, Mac users have generally been quite responsive to version upgrades. Sure, you'll still find the occasional person running OS X 10.4 Tiger (like the client I upgraded last week), but a lot of Macs are now running Lion (OS X 10.7) or at least Snow Leopard (OS X 10.6). Omni Group, developers of the great task manager app OmniFocus, keeps a close eye on the OS version installed on user machines and has made their data available to the development community.
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