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March, 2017 Preview of Monthy Quality Rollup...(KB4012218) - Optional?
Why is the KB4012218 considered optional? Is it because I already have the same individual updates installed or is it because they don't apply to my system? And why do they use the word Preview? Is it optional because it's not officially released yet? Like Beta software?
All comments that provide any additional insight on my question are highly appreciated.
Thanks for reading!