Take context from the input text and decide on the accurate relationship between 'Skype' and 'Microsoft' from the options provided.
Options: operator, position held, chief executive officer, headquarters location

"It is now clear that the enforcement action taken in the US and EU under their laws against the 'exclusionary conduct' of Microsoft a decade ago created opportunities for new market entrants like Google's Chrome browser, Apple's Safari browser and iTunes, YouTube, Adobe Flash, Skype and providers of web-based mail such as Google and Yahoo."
operator