I have a tablet I only use for surfing the internet. That's it. I don't even use it for email. I never enabled Bitlocker, but it was either enabled by the factory or MS enabled it with an upgrade without asking. One day the machine asked me for a password that I didn't remember ever setting. I was unable to use that machine until a full wipe, because Bitlocker had locked ever bit of data on the harddrive without a password I remember even being asked to set let alone remembering.

I was annoyed because I had to format and reinstall, but I didn't lose anything. If that had been my main machine, though.... holy shit would I have been furious.