Why should it surge? What's Ballmer leaving have to do with NOK? They are different companies and MSFT has a list of names for the CEO position, there is no issue that should concern NOK. You think the next CEO will be using another system? MSFT will go on like it always has.
Moody's news is a non-issue as well. This is the price of doing business.
Why would it surge? Umm how about becuase PC sales are dying and its all about MOBILE. Who is doing Windows Mobile (i.e Windows Phone and Tabs) successfully. By any metric you can only answer NOK. The jury is still out on whether the NOK tab will be a success, but there is no denying they are not creating traction with WP8.
That being said a new CEO who focuses on mobile and comes from mobile could ONLY mean good news for MSFTs MOBILE PARTNER, NOKIA