Perhaps Microsoft used Excel when they calculated the severance packages of some of the 1,400 workers they recently laid off. At any rate, apparently they made some errors, and are now asking some of those laid-off workers for some of their severance package back. According to a report by TechCrunch, the letters have been sent to more than one person, and it appears some may have even been underpaid. However, no one has been informed as to what went wrong in the calculations (at least via the letter; see below