Hi everyone. A week or so ago I finished watching a TV show "Billions" - Season 1. However, on the last minutes of episode 11, where the wife of federal prosecutor types on her MacBook, I noticed that the macOS was Yosemite (or later ) with Pages having new design, but the Mail was of oldskool design (Lion 10.7 or Mountain Lion 10.8). Given that Mail version is tied to MacOS, how come that Mail had an older version than that of MacOS version? Couple of screenshots are attached.