We’ve certainly come a long way since the honeymoon days of You’ve Got Mail, the 1998 Meg Ryan romcom in which each new electronic missive set Tom Hanks’ heart fluttering (and vice versa). These days, in tech circles, you’ll hear tales of folk who’ve set their email servers up to automatically delete unread emails after a week – before going on holiday for a full fortnight. Others have reduced the OOO to a single word in the subject line: “Nope.”
World War I – known at the time as “The Great War” - officially ended when the Treaty of Versailles was signed on June 28, 1919, in the Palace of Versailles outside the town of Versailles, France. However, fighting ceased seven months earlier when an armistice, or temporary cessation of hostilities, between the Allied nations and Germany went into effect on the eleventh hour of the eleventh day of the eleventh month. For that reason, November 11, 1918, is generally regarded as the end of “the war to end all wars.”

But this is where it becomes a power thing. The OOO person says that everyone else wants stuff from them that the sender can’t get elsewhere and you need to grovel to get it from them.
Anyone who communicates digitally needs to set up ooms conversely, if you are out for just a day, your contact could reasonably expect a response i am out of the office for the thanksgiving week: