Refer to the input text as context and select the correct relationship between 'Skype' and 'Microsoft' from the available options.
Options: operator, headquarters location, chief executive officer, position held

"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