Utilize the input text as a context reference, choose the right relationship between Skype and Microsoft from the options. Options: 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.

Because in the past, when Microsoft was selling mainly Skype for Business, large companies always took the time to do a pilot, deployed it with several branch offices, and then continued the deployment every quarter in coming years.

Answer: operator