Trusting MS with my data? I don’t have any .doc, .xls, etc, nor proprietary data kept “in sync” with my desktop with anybody’s “cloud”. That’s stands about as much chance in hell as it would with tax companies wanting me to upload my tax data to their company for submission.
Sure, I keep BS email accounts out there but anything else, forget it.
If you send email attachments, your data is already on someone else's system.
Your email is housed on someone else's system until you retrieve it. And even then it is often backed up on the mail server.
And even if you only transfer your data via floppy disk, you can still be at risk.
If your OS is provided by Microsoft, you don't know what they are doing with your data. With some technical background you can use some sniffing tools to make an informed guess, but due to the closed nature of the OS you really don't know.
Microsoft has been busted before for having their OS "phone home" and send data about you and your PC back to their systems.
And that's when everything is working as advertised. If you're running a Windows OS you have about a one in three chance of having some sort of malware installed on your system. Certain kinds of malware searches for logins and passwords to banking sites. Other kinds do keyword searches on your documents and uploads anything interesting to the bot master servers.
As a former network security professional, I'm much more content to encrypt and upload data to one of Google's servers in the cloud that I would be to allow Microsoft access to any of my data anywhere for any reason.