Just so you all know: LINUX is not exempt from this issue!!! I'm running Sierra 10.12.6 on a iMac Notebook. I have Microsoft Office that has been trying to push updates to me. I've stymied them off for some months and finally the updates went. It erased everything in my Documents folder and replaced it with just Microsoft Office folders.
Here's where it gets bad: I have my pictures and documents synced for backup to a cloud service. It immediately wiped it from the backup cloud service as well.
This. Is. Crazy. How the f$*k is Microsoft able to get away with this junk.
Not only where is the lawsuit to signup, but how has Microsoft not pulled this update attempt after knowing all this time that it is devious?