By Julianne Pepitone @CNNMoneyTech

Research in Motion has finally launched a much-needed update to the PlayBook tablet, which now includes built-in features like email and calendar.

The major head-scratcher: The PlayBook lacked built-in, native apps for key functions including email, calendar, address book and BlackBerry Messenger. Tablet users had to connect to a BlackBerry smartphone for those functions.

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