Last night Apple CEO Tim Cook made his first appearance with Walt Mossberg and Kara Swisher at the All Things Digital D10 conference. He was continuing a trend that his former boss started; Steve Jobs appeared at the conference six times between 2003 and 2010. Mossberg and Swisher have just announced that All Things D is making all six of Jobs' appearances available for free via iTunes, in both audio and video form. From his first appearance after taking back the helm of a troubled Apple, to his tagteam interview with Bill Gates in 2007, the episodes are a must for anyone wanting to look back at an individual that helped change the world of technology as we know it today.