To get rid of Microsoft AutoUpdate on Mac, remove these files and folders:
In the System Library (you need "sudo"):
In your user's Library (needs to be done for each user):
~/Library/Preferences/com.microsoft.autoupdate2.plist ~/Library/Preferences/com.microsoft.autoupdate.fba.plist ~/Library/Application Support/Microsoft AU Daemon ~/Library/Application Support/Microsoft Update Assistant ~/Library/Saved Application State/com.microsoft.autoupdate2.savedState
Depending on the version (2011 or 2016/O365), you may miss one or more of these files and folders.