Among Jackson's grievances about Yahoo is everything Mayer has blown money on, from failed acquisitions to lavish parties and sponsorships.
He claims that a December 2014 party had a photo shoot that cost Yahoo $70,000 alone, and that the company's Roaring 20s-themed holiday party this year at Pier 48 in San Francisco cost $7 million. (A source told Vice that the cost was actually less than a third of Jackson's claimed $7 million).
We've rounded up some pictures from Yahoo's lavish holiday party so you can see what it was like.