If you don't believe Microsoft is transorming itself into a company solidly rooted in the cloud, you're clearly missing the writing on the wall.
In the February 2013 release, Microsoft turned a new page and proved why it's a reliable comeback kid in the cloud. And spam filtering was bottom tier, proving to do little in stemming waves of junk mail. Its treatment of browser-based users who wished to forego desktop versions of Outlook and Office disappointed. Outages continuously plagued the service.
Merely a half year ago, my thoughts on Office 365 were salty at best.