Weird, when I opened my latest db made this week on the top identification bar after the db name it says 2007 – 2016 format. (see attachment) I have Office 365. When I open my joke file it doesn’t list the year format, however after opening it a few times I noticed it flashed 2000 then disappears.
That's why I always implemented forms to have a Close command button including my switchboard form. So that meant I could turn off the [X] for the Access window too, and rely on the Quit button on the switchboard.