Microsoft today announced that it's releasing a version of Skype that's optimized for devices running between Android 4.0.3 and 5.1. The update will be automatically available through the Play Store.
Android 4.0.3 RSS
Microsoft is dropping Skype support for older versions of Android, and as it focuses its development efforts on the Skype UWP app for Windows 10, older Windows Phone handsets will be left behind too.