Now why would you even think something like that? Windos-based OS'es are so inflexible there's no profit in using them on any embedded devices. The whole WP thing was done for political reasons, not technological.

Now when NMP is leaving Nokia, there will be no MS based OS'es in any Nokia products, instead there are at least 4 other major platforms that I know of; one is totally own-grown, two are loosely based on BSD implementations and one is a linux distribution.