Their going to spend nine nights together, during wich they discover that sometimes all one needs to approach perfection is a saxophone and a broken alarm clock.

UNESCO: Culture

Besides that they will have as partner the best hardware maker on market with strong presence on developing markets wich Apple and Google has not reached yet and the largest mobile marketshare for delivering services like search, ads and social media.

FORBES: Nokia CEO Clarifies Battle Against Android, Clears Up Misconceptions

Also about synergy power betwen them perhaps I would add the fact that together they dont overcome their competidors in nothing exept for build quality Nokia phones have and the new concept of UI WP7 has and some services like office wich has not atracted many users yet.

FORBES: Nokia CEO Clarifies Battle Against Android, Clears Up Misconceptions