Mike in MD - Microsoft DOES call people first. They hire commercial sales reps to contact businesses on their behalf to identify decision makers and work with them to find the best products available for their business and get them set up with licensed products. The CID listed is the PIC assigned to their desk phones at the company they hired. This is not to be confused with the scams calls being made that say your PC is infected.
Got a call from this number with plausible but story about how my daily newspaper subscription got canceled because of some computer error and they needed my credit card info to reinstate the subscription. I said I would try and do without for a few days.