I know you're complaining, but only having 10% of your users not on the latest OS update is really something we should be cheering.

The progress (some) OS vendors have made at keeping people current is really pretty fantastic when you compare to the situation 10 years ago.

I have an iPad 1 that was adequate to surf the web on iOS 4.3, and I will never be able to downgrade to that version again. Now I have a brick on iOS 5 (unbearable out-of-memory crashes). I earn my money on iOS and I still can't really cheer at handcuffs. =/

And more than 30% for me.