When does a CBB lose servicing

Q. At what point does a CBB lose servicing?

A. With Windows as a Service the most recent two CBB versions are supported plus a sixty day grace period. This means that a CBB stops being services 60 days after the second newer version is declared as CBB. For example once Creators Update (1703) is declared CBB, 60 days later 1511 will no longer be supported.