Now you're moving goal posts.
No i am not. If you count instancing then you can as well just ignore servers and say milions of players since this is how much some mmos have at the same time. It is at the same time in same game that is important. Excel spreadsheets also don't count (like ogame and other browser mmos who claim to have 100s of thousands of players at the same time)
Either way i got my answer. Seems that only Eve and Mortal online get some players at the same time. Eve is quite understandable since it is half excel. Mortal Online 2 seems to be much more impressive though since there is some degree of latency sensitive that needs to be met in order to play it.
Planetside2 also has from time to time 1000 players at the same map and you can definitely feel those 1000 players as it is complete mayhem.