I did some testing in response to the report that Group B was “missing” a large number of Security Updates by UNCHECKING (not installing) the “Security Monthly Quality Rollups” instead of hiding them.
If you get bogged down with the data, read the top and bottom text of Parts 1 and 2 and the synopsis in Part 3.
This Topic consists of three parts, separated into three replies, because of the length.
Part 1 – Hiding Rollups on a Clean Install
Part 2 – Installing Group B “Security Only Quality Updates” on a Clean Install
Part 3 – Implications, Observations and Conclusion