Summary Box: RIM releases new PlayBook software

FINALLY: Research In Motion released an upgraded operating system for its struggling PlayBook tablet computer on Tuesday, almost a year later than it first said it would.

DETAILS: The free software allows for built-in email, calendar and contacts on the tablet. When RIM launched the PlayBook last April it said would add the critical features within 60 days, but kept pushing that back.

PLAYBOOK’S WOES: In December, the tablets that originally cost $500 were selling for $200, below the cost of making them. RIM said it sold 150,000 Playbook tablets last quarter. That number pales in comparison to the iPad.