In any case, it never occurred to me that some companies would run office products and mainline applications on the same network.
Sadly, it happens a lot. I can’t speak to the actual frequency since it only ever comes to attention when someone has done the wrong thing and is trying to figure out how to fix it, but it is certainly common enough. Often it seems like a case of management believing the sales people, but sometimes there are even old time IT people in the mix, not paying attention to the DBA who manages the high transaction DB.