Here's one reason I'm moving from Google Apps to Office 365 in the coming year. From Microsoft's Trust Center website: "No Advertising: Office 365 does not build advertising products out of Customer Data. We don’t scan your email or documents for building analytics, data mining, advertising, or improving the service." And, "Where: You know where Office 365’s major data centers and personnel are located and the logic used to determine where your data is stored.
Who & What: We offer clear information on who can access your Office 365 Customer Data and under what circumstances they access it."
Sorry Google, but it's just too creepy to have you reading all my mail and documents. I'll pay extra for the privacy that Microsoft will give me.