66 days isn't a lot of time. For a start up I can understand, but from MS I thought they would give people that arent happy with skype a chance to think about it.
I think this was first announced in November (not much more time, but at least it's over 100 days). This is confirmation of the exact deadline.
Edit: Yep, that's what the article says and here's the HN discussion. http://news.ycombinator.com/item?id=4753236