Not sure that adds up to $7b (I dunno how to evaluate anything that big), but it is something. I'm sure this has a big chance of being useless, but it also has a chance of being helpful.
If in 2 years (assuming skype can keep it's usebase) every windows pc tablet & phone is connected to skype by default, it could be strenthened. If skype integrates in some significantly useful way with outlook/exchange (scheduling calls, confirming meetings, emailing chat sessions, synching contacts) it could help strengthen the corporate MS position (the real cash cow).
Like many decisions, it's not the decision itself that is most important, it's the subsequent actions, the execution. That said, a 1m phone giveaway would be epic. MS have money to burn and big fish to catch. Burn. Catch.