What is the relationship between Windows Phone 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.

Here are six important things you should know about Microsoft Windows 10... Microsoft announced that Windows 10 will be free for customers running Windows 7, Windows 8.1, and Windows Phone 8.1 if they upgrade in the first year after launch.

Answer: developer