I want to know the answer to the following question:
Who are Windows main operating system competitors?
All the background I'm provided with is that "In particular, these changes included a touch-optimized Windows shell based on Microsoft's "Metro" design language, the Start screen (which displays programs and dynamically updated content on a grid of tiles), a new platform for developing apps with an emphasis on touchscreen input, integration with online services (including the ability to sync apps and settings between devices), and Windows Store, an online store for downloading and purchasing new software.". Is that enough to answer the question?
Answer: no