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Microsoft CEO Satya Nadella admits giving up on Windows Phone and mobile was a mistake
(www.theverge.com)
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Too be fair, it was a big bet and at that point it was Nokia's only chance of remaining at the top. It they had used android at that point in time, they would have started from the bottom in the race for the android domination that was already seeing some large companies fail. Going with Android that late would at best turn them into another Sony Ericsson unless they executed everything perfectly (which wouldn't happen with the large amount of in-fighting the company had). Going with Windows Phone would be all or nothing. Only time showed it ended up being nothing.