The Windows Phone SDK update for WP7.8 is already there and many people already started receiving the WP7.8 OS update in their existing WP7.5 handsets. If you are a developer, you might want to integrate the new Live Tiles in your existing application to give it a good look. In this post, I will guide you to update your existing apps to include the new live tiles. Continue reading to find out the step-by-step process to integrate it. The Windows Phone 7.8 OS update and SDK comes with the new tile sizes of Windows Phone 8 named “small”, “medium” and “wide”. If you are using a Windows Phone 7.5 Mango device, you can experience the same by updating your current OS version using the Zune software. If you still did not receive the update in Zune, you can try an alternate way to force the update.