They are certainly somewhat in conflict, but remember that even corporations vary, and sometimes change the way they do things. From the outside, it looks like Nokia is dabbling in open source (seriously, but not with the full company committed), but there is a part of Nokia (the Maemo part) which is trying to find a way to make the combination work, and which may grow if it does work. Since nobody else has seriously tried in this area, it's hard to know whether it will succeed. (And if it fails with Nokia in the end, that doesn't mean it can never work with anyone. And if Nokia does shy away from openness, because open source, Nokia will still have left a legacy that others can build on).