Boy, I can't remember any officially sanctioned serious work drinking since the mid-70's. I was working for an apparel manufacturer with HQ in Boulder, CO. Christmas week was a regular boozefest. Bottles of liquor, gifts from various suppliers, began appearing in the Purchasing Manager's office. Anytime after 11 in the morning, it was not considered inappropriate to stop by for a shot.

Throughout the years, I have been aware of the odd bottle kept in a desk drawer, but drunk mostly on the qt.

In 2000, I was Controller for a small software company in Charlotte, NC. After 5:00, occasional informal gatherings in the President's office would include the offer of a bottle of beer from his office fridge. I don't recall anyone having a second, though.

In 2010, I left a job as Finance Director for a foundry in Oxford, Alabama. A parting gift from my IT department was a bottle of Woodford Reserve. At 4:00, we closed my office door and 5 or 6 of us polished off the bottle.

I haven't seen alcohol consumed at work since, although I do see moderate drinking at company sanctioned events offsite (including last weekend's company picnic at a water park that happened to sell beer).