I worked at Microsoft for 12 years and I probably moved desks 20+ times. A handful of those was because I changed teams, but even in the same team, you do tend to have one or more office moves a year. Team focuses change and often people are re-grouped as a result. Other times you just run out of space in a building and they move your team to where there's more room (because maybe another team was disbanded or moved somewhere more suitable to their size).