WHAT A SURPRISE! This actually is the Microsoft switchboard. We received a call showing Microsoft Corporation as the caller. I thought, sure it is. Turns out it is a client who works at Microsoft and was returning a call from work. Glad I let it go to voicemail, because I would have been extremely snarky when I answered.
They have an ip address of 65.52.180.227 also, they were trying to hack into our computer this morning
10 times, I called that number no one was there, if they don't have an answer for me, I'm reporting them.