We have seen Dell present a Windows Phone 7 with slide-down keyboard and here we have a leaked Sony Ericsson Windowsphone with a slide out keyboard. Sony Ericsson has been in mixed thoughts about a WP7 phone and it isn’t surprising that they are testing prototypes. So does Nokia’s grand entry with WP7 increase the optimism in the Microsoft mobile platform? The SE device in picture appears switched on, but isn’t in landscape mode as it should be when the keyboard is opened. Perhaps the home screen doesn’t react to the slide out or its just way to early version of the device!