Skype wasn't that great to begin with but that was also a long time ago. To bring it up ignores everything they've done in the past 5 years in OSS.
What about Mono? Microsoft bought Xamarin and it's gotten incredibly better and that's a closer parallel because it was a development platform. Heck, even Mojang and its products have gotten way better and more stable.
Microsoft's OSS initiatives have been fantastic for a while now. I don't understand the knee jerk reactions of "I have to move my code immediately!". Even if Microsoft's ultimate goal is to set GitHub on fire you'd have years before it happens, realistically.
It did take Microsoft a long time to burn CodePlex down to the ground.
CodePlex was already dying. Same as code.google.com ...
Skype WAS GREAT before microsoft buying it. !
And also TeamViewer WAS GREAT before you know..
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