That was an awefull lot of money to pay for what is now effectively just a name. Ok, and a userbase.
They've effectively gutted and replaced the main software they purchased, now they dump the devs. You'd think it would be cheaper and easier for a company the such size and with the resources it can command to just simply create their own stuff from scratch. It seems they can't do that though. Instead of competing, they have to buy up and destroy the competition. Maybe that's cheaper in the short term than licensing or working around the IP. It's just legalised bullying, except they fight to the death and stifle competition. MS will now hold all the P2P IP from Skype (which they now don't really need) so making it almost impossible for anyone other than another giant to enter that market.