Microsoft will try to force itself back into the tablet market again in 2011 with a repeat of its HP Slate demo at CES this year, a new leak detailed today. CEO Steve Ballmer will once more demonstrate examples of Windows 7 tablets and is expected to highlight both an unnamed Dell example and the Samsung Gloria. The Samsung device depends on a slide-out QWERTY keyboard in landscape but uses an on-screen keyboard in portrait mode, the New York Times heard.