I had W10 1511 installed on my system and upon the launch of the W10 1607 (Anniversary Edition), I set my system not to install updates and to defer upgrades
Until Saturday this was working and I had no reason to check the settings just to "double check"
I woke up on Sunday to find that I have several notifications - including one from the system advising me that I had installed a feature update - checking the system, sure enough I was now running W10 1607
Checking the start menu, all of my customisations had been removed and I had additional bloatware installed.
Needless to say I was not a happy person and after cursing and swearing Microsoft, I started looking for what I had missed in settings that allowed the update to get through.
Sadly my Google search ability fails and so I thought I would ask other geeks how they have blocked Windows 10 1607 from being installed ..
Hopefully when I roll back (I believe I have a week), I can stop it from updating again