in the "more advanced" tech circles(on slashdot) we discussed though which parts of nokia actually were sold to Microsoft(basically, the part that made windows phones), not the networks part. ironically, the networks part had been doing not so good for a few years BUT was ok and is still kind of OK when microsoft crap was dumped on nokia. Also to note, the networks part was called Nokia Siemens Networks due to a merger a while back(fairly recently the requirement to keep siemens in the name expired).
which maybe begs the question, why the fuck did Microsoft even buy it? well, to make _sure_ that Nokia didn't bring any more android phones to the market(x,x+,x xl, x2 in asian markets were released shortly before the takeover). for Nokia it gave the possibility to shed thousands and thousands of people and dump them to be microsofts problem(and microsoft has since been firing them out of a cannon on the job market). without the deal, even with Elop the Trojan at the helm, it was unsure if _anyone_ would have been producing Windows Phones anymore. However, you could also then ask why Microsoft didn't just start buying phones from a contract manufacturer and sell them with their own name(which is what they're effectively doing now anyways!! since they dumped the nokia name from the microsoft phones and it runs a full microsoft stack AND they didn't even buy the Maps portion of the old Nokia! they're still paying for using that shit)
also, Nokia that remains is barred from selling Nokia branded phones for a few years. they're free to sell a Nokia branded tablet though and they are doing that(also running Android).