Microsoft can delete or block any content for any reason without notifying you.
You can be tracked by Microsoft through social media sites setting cookies.
Microsoft is not required to share information when following through with requests authorized by the government.
Key Points in ToS:
"We may also block delivery of a communication (like email, file sharing or instant message) to or from the Services in an effort to enforce these Terms or we may remove or refuse to publish Your Content for any reason."
"Some of our websites include social media cookies, including those that enable users who are signed in to the social media service to share content via that service."
"Microsoft reserves the right at all times to disclose any information as Microsoft deems necessary to satisfy any applicable law, regulation, legal process or governmental request, or to edit, refuse to post or to remove any information or materials, in whole or in part, in Microsoft's sole discretion."