If you liked my article on Lync, I recommend this article from Derrick Wlodarz on why Microsoft should retire Skype in favor of it:
It’s a bit long (who am I to talk!), but the points are very valid and exacerbated by the fact that Enterprise Customers, like Carlsberg, are tying our IT roadmaps very closely to Microsofts when we switch to Office 365 and Lync.
There’s nothing worse than staking your IT roadmap on a product with an unclear strategy and confusing design decisions.