Title is a bit misleading; from what I gather this is what happened:
Micron Electronics was the PC making subsidiary of Micron, making PCs since 1991. In 2001, Micron spun off that subsidiary which then changed it's name to MPC. MPC purchased the professional/educational division of Gateway and Acer purchased the rest. MPC shut down their Tennessee, US plant, laid off most of their employees and contracted out all future PC assembling to a Juarez, Mexico based supplier(Flextronics). On October 28th, 2008, Flextronics suddenly canceled the contract citing lack of faith in MPC's ability to pay. On November 4th, their stock was delisted. Then MPC filed for bankruptcy protection while they look for a new supply source.