Well, right now Nokia doesn't have any core OS software team. WP is done by MS and Symbian is done by Accenture. This leaves Nokia with Maemo/MeeGo and S40. Why they even bother with S40 is a mystery since there are several light weight OS'es available that will do the job just fine. But then again, S40 has always been a good OS, so maybe a change will not be worth it.