In the past few years the number of Easter eggs hidden away has been falling. I mean the latest versions of Office have virtually none.

Has Microsoft limited the ability of the developers to add in the Easter eggs? 

My favourite Easter egg of all time has to be from Excel 95, that doom like game with the credits at the end aka "Hall of the Tortured Souls". The flight sim was also good, even if a bit hard to control in Excel 97...