You're falling for a marketing trick. What that type of section usually means is "there's someone from Microsoft that signed up for our service using his work

You're falling for a marketing trick. What that type of section usually means is "there's someone from Microsoft that signed up for our service using his work account", sometimes it means "there's some tiny team within Microsoft that uses our product", but it very rarely (if ever) means "the entire company is completely reliant on our product".