[thisnotmyacc]

I don't think the plan is relocations. More than likely, MS see server numbers growing over time, at the very least for the foreseeable future, and they'll be located once, and then decommissioned, not moved.

That may change, but I doubt there are less server farms in 2020 than now.

As a side note, isn't that also Google's plan - the server farm as a single entity, where nothing is really fixed, just turned off and eventually replaced? In such a world, where a server farm exists then dies, underwater seems a great place for them. No regulations, no repairs, locally powered via means that no one can complain about (NIMBYism is a powerful force) just run until decommissioned.