What is the lowest target SDK Version Corona builds for (iOS & Android)? Can I set this anywhere? Could not find information about that...

Thanks,
Nils

You are probably confusing the target SDK with the minimum OS version. On iOS, you generally build for the latest SDK and limit the minimum OS version.

Currently, Corona builds against the 4.3 SDK with stable 591 and the 5.0 SDK in the latest daily builds. Corona's minimum OS version is 3.1 (though this may go up in the near future). If you need to increase the minimum supported version, add the "MinimumOSVersion" key to your build.settings in the iphone = { plist = { } } section with the version you desire.