Microsoft‘s Xbox video game division will shed 3,200 jobs and four of its game studios in what CEO Asha Sharma is calling “the most significant restructure in Xbox history.”

Sharma announced the restructuring in a memo to staff Monday, titled “resetting Xbox.” The changes will happen over the course of the next year, with about 1,600 layoffs happening today and the remainder being spread out over the next 12 months or so.

“I recognize that a year-long restructuring creates additional challenges,” Sharma writes. “Unfortunately, it is not possible to make all the necessary changes in a single day, and I wanted to be direct about the scale.”

Among the changes: Compulsion Games and Double Fine Productions will be spun out to their management to operate as independent studios, while Ninja Theory and Undead Labs have secured funding and will operate under new ownership.

Sharma writes bluntly that “our business today is not healthy,”citing lower margins and lower growth than expected, even as the company added staffing: “And now the industry is facing the most severe hardware crisis in its history. We must reset Xbox,” she added.