Hi trucidare.
As i know, to send app in appstore, application can be compiled using sdk 2.2.1 but must be OS 3.0 compliant.
I submit my app, and itunes connect checks that app was build using 2.2.1 and its shows a checkbox 'OS 3.0 compliant"
I know that almost all users with iPhone has now os 3.0, but i know that for iPod Touch users, the firmware upgrade cost about 10$.
To reach all users, i decide to build my app using this version 2.2.1.
I read documentation and i didn't find that app must be build using 3.0. I read that if you use App Purchase functions, it requires to be build using 3.0.
Well, i don't really sure of this.
Anyone can confirm?
King Regards, fjsantos.