I qualified for free ML with mid 2012 MPA purchase. After 24+ hours still no free upgrade email from Apple so I went ahead and purchased ML (and made a USB install drive). Still no upgrade email from Apple. My question is - my wife has Lion on her late 11 MBP. Can I install ML on her computer using the same USB install drive as I used on mine or is it limited to one computer? Her Apple ID is different than mine. Thanks.