Mi, oh, my! MI Windows and Doors has your home's openings covered. The private independent company manufactures vinyl, aluminum, and composite windows and doors. The company's BridgeWood line features composite windows that have the appearance of wood. Other products include single- and double-hung windows, sliding windows, patio doors, awnings, and casements used in residential and light commercial applications. MI has manufacturing plants across the US and distributes its products through such retailers as The Home Depot, Stock Building Supply, and Lowe's.