For most corporate PCs, the former 10 years of support shrank to 12-18 months, the span between the designation of a version as ready for the "Current Branch for Business" (CBB) track and the appearance of that version's second successor on the CBB.
1607 just hit the "Current Branch" (CB) the track designed for consumers -- and designed to use consumers as testers -- but won't be okayed for the CBB until some future date, most likely four months from now, or in late 2016.
when is ANNIVERSARY UPDATE for ENTERPRISE EDITIONS gonna be released?