Does this mean they will not "access, disclose and preserve personal data, including your content (such as the content of your emails, other private communications or files in private folders)" unless there is a serious legal problem? Or are they going to preserve my personal data no matter what? If they are going to keep my private email and my private information without reason, then we no longer have any privacy. Google has already violated this, now is Microsoft going to do the same?
Many, especially the young have no idea what this means. But, all ought to know by now how much corruption exists in the world. There are people and businesses that will take personal information and use it to harm others. And, even if all at these computer companies were honest, what happens when when dishonest people hack into their system and gain access to private communications? Businesses and governments are being harmed today because of this. Microsoft has no business keeping our private data in their possession unless illegal activities have been found. And, then the government and private companies can get a warrant to access private information.
Google and facebook have set the stage for great harm to be done to individuals, companies, and governments. I have not downloaded 10 and will not until I know I can use my computer without them keeping track of my personal correspondence and the work I do on my computer.