[allwein]

I was working with a large retailer to develop a free iOS app. For the initial release, they wanted to target the widest number of users that they could, so our requirements were 3.1+ only. We included a bunch of analytics to track use and client statistics.

After being live for 45 days, it has around 50,000 users total at this point. Of those 50,000 users, less than 2% (817) were using pre-4.0 devices.

At that point, it was easy to convince them to abandon 3.x support for the next version, which will greatly simplify a lot things for us. I'm anxious to see how quickly 5.0 is adopted once it hits.

[Tomek_Kopczuk]

I predict it will be adopted even quicker than the 4.x branch, due to new notifications. Much sought after feature. Few months and 4.x market share will probably be close to 3G market share.