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.

"Their support, coupled with our close alignment with Microsoft as an investor and key partner, will help us scale more aggressively and meet the demands that come with the ever growing UC market leadership of the Skype for Business platform."

Answer: operator