HP has over 317,000 employees, thanks in large part to acquisitions - Microsoft is no different here.
Lots of redundancies can be eliminated (unfortunately for those employees) - and in some ways, this is a very bad thing. As monopolies grow, they are able to be more efficient and eliminate jobs. We don't stop and think about the fact that in a massive conglomerate corporation place once stood several competing corporations that meant competition (lower prices, better service to consumers) and more jobs - but of course, less return to investors and less pay to executives.
This is a troubling trend, as the American Dream is snuffed and the middle class finds itself dwindling deeper into poverty, while the richest seem to work tirelessly to increase that gap. I'm no socialist or communist, but it occurred to me the goal of these assholes wasn't to get richer - that's something that happens when you are that rich anyway - it is to make the rest of us poorer.