The plaintiffs alleged that Microsoft had abused monopoly power on Intel-based personal computers in its handling of operating system and web browser integration. The issue central to the case was whether Microsoft was allowed to bundle its flagship Internet Explorer (IE) web browser software with its Windows operating system. Bundling them is alleged to have been responsible for Microsoft's victory in the browser wars as every Windows user had a copy of IE. It was further alleged that this restricted the market for competing web browsers (such as Netscape Navigator or Opera), since it typically took a while to download or purchase such software at a store. Underlying these disputes were questions over whether Microsoft had manipulated its application programming interfaces to favor IE over third-party web browsers, Microsoft's conduct in forming restrictive licensing agreements with original equipment manufacturers (OEMs), and Microsoft's intent in its course of conduct.