Microsoft said that they'll open up Windows Phone 7 a little bit more to developers to allow their apps to run while the screen is turned off. The screen lock currently causes most apps to shut off and then have to reload or resume slowly when you unlock the screen, something that many users, myself included have found to be not only annoying, but also sometimes even time consuming.
Up until this point, apps that wanted to run whilst the screen was locked had to get the users permission to run. While Microsoft apps such as Zune, mail and more could already run whilst the screen was locked, without users telling them to do so.
The new rules require that developers demonstrate that their app will only use a small amount of battery life in the background.
Microsoft's Charlie Kindel said, "This's an example of us continuing to listen to customers, we think it's a much better experience."