What iPhone OS to target? [closed]

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I'm building several different projects for iPhone (and iPod Touch, I suppose) in XCode. What is a reasonable iPhone OS target deployment version?

For instance, can 2nd generation iPod Touch devices upgrade to iPhone OS 3, so that I could be using iOS3 as reasonable minimum and still target the iPod Touch (figuring it's OK to ignore those who don't开发者_运维百科 want to update their OS)?

Part of this question, I suppose, is what is the market share of the different iPhone OS versions among deployed Apple devices (iPhone/ iPod Touch/ iPad)?

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Old iPhones and iPod Touches should be able to run 3.1.3 (but note that Apple charges for upgrades). iPads only run 3.2 at the moment.

Of course you miss the real question: Will users on OS 2.x buy my app?

There's no easy way to tell without phoning home on a new install (and even that's not entirely indicative), but I suspect the answer is no.

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You may refer to this question:

https://stackoverflow.com/questions/1021929/what-percentage-of-iphone-users-have-the-different-versions-of-iphone-os-firmware

and this:

Support legacy iPhone users