Here's my most memorable Microsoft snafu: My desktop was just upgraded to Windows 10. The "Favorites" links in File Explorer were converted into "Quick Access"

Here's my most memorable Microsoft snafu: My desktop was just upgraded to Windows 10. The "Favorites" links in File Explorer were converted into "Quick Access" links by the Microsoft migration process, but the aliases (titles) of the links had changed, or so I thought. I renamed the aliases back to what they were under Windows 8. The phone started ringing with complaints, and to my horror I learned that I inadvertently renamed widely-used WAN and intranet folders. Quick-Access had no aliases: I had inadvertently changed the actual folder names. A colleague walked by and asked, "Why are you sweating and white like a ghost?" Fortunately I renamed them back before too much damage was done.