What is the relationship between Skype and Microsoft in the context of the input sentence. Choose an answer from: product/material produced; manufacturer; distributed by; industry; position held; original broadcaster; owned by; founded by; distribution format; headquarters location; stock exchange; currency; parent organization; chief executive officer; director/manager; owner of; operator; member of; employer; chairperson; platform; subsidiary; legal form; publisher; developer; brand; business division; location of formation; creator.

Unify Square is recognized as an elite partner of Microsoft and the industry leading provider of software and services designed to monitor and manage Skype for Business in Fortune 500 enterprises.

Answer: operator