"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."
What is the relationship between 'Skype' and 'Microsoft' in the context of the input sentence.
Options: position held, chief executive officer, headquarters location, operator