The BlackBerry PlayBook was the one and only tablet ever produced by the company. The OS, built by QNX, paved the way for BlackBerry 10. There were some positives, especially the multitasking experience which called to mind the card-swiping UI found on webOS. At the time, BlackBerry was still overshadowed by the godawful launch of the BlackBerry Storm 9530, even though that debacle took place roughly 30-months before the PlayBook was launched.
So when BlackBerry released the PlayBook without a calendar app and a native email client (only the one application that BlackBerry was well known …