Having worked at Microsoft for almost a decade, I remember chatting with their security people plenty after meetings. One interesting thing I learned is that Microsoft (and all the other top tech companies presumably) are under constant Advanced Persistent Threat from state actors. From literal secret agents getting jobs and working undercover for a decade+ to obtain seniority, to physical penetration attempts (some buildings on MS campus used to have armed security, before Cloud server farms were a thing!).
— com2kid