Nokia keeps the other two divisions.
Nokia is now primarily a telecoms infrastructure company, like Alcatel-Lucent. They're pretty closely matched. Alcatel-Lucent had €14.4 billion of revenues in 2012, while Nokia Siemens Networks took in €13.1 billion of revenues.
There's also the mapping division, but that's just 10% of the new Nokia's revenues. I'm surprised Microsoft did not buy it, as Google and Apple both own their own maps. In fact, I wonder if the mapping division wasn't what scuttled the previous attempts to reach a deal.
NSN is no longer Nokia Siemens Networks; it's Nokia Solutions and Networks now, and Siemens is no longer part of it.
It'll still exist. Most of the top executives are moving to Microsoft as part of the deal though.
I am curious if this deal required shareholder consent of any type. I'm sure the board had to approve. Still I don't know how I'd feel if I was holding onto a decent chunk of Nokia stock right now and I didn't get any say in selling out our core business.
[1]http://www.theverge.com/2013/9/2/4688530/microsoft-buys-noki...
So yes, it will require consent from Nokia shareholders.