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Microsoft implements strong measures to help protect your data from inappropriate access or use by unauthorized persons. This includes restricting access by Microsoft personnel and subcontractors, and carefully defining requirements for responding to government requests for customer data.
Microsoft’s commitment is “When you entrust your data to Office 365, you remain the sole owner of that data: you retain the rights, title, and interest in the data you store in Office 365. It’s our policy to not mine your data for advertising purposes or use your data except for purposes consistent with providing you cloud productivity