When I saw the announcement, I was a bit surprised. Not that Skype was getting acquired, but that Microsoft was buying them. There have been rumors of a number of business bidding, but I didn’t recall seeing MS as one of them.
When you look at the capabilities Skype has that others have not been able to perform reliably, it does leave open some interesting possibilities in accelerate the use of X-over-IP techniques in business through the integation of MS products. It will be interesting to see how MS plans to monetize the investment.