Elon Musk's xAI is working on a secretive project called MacroHard, designed to recreate Microsoft's core software products using AI alone. The internal effort uses Grok and other xAI models to simulate tools like Excel, Word, Windows, and GitHub, without relying on human-written code or Microsoft’s APIs. This article breaks down Musk’s strategy, how AI agents are being trained to function as full-stack developers, and why this could challenge Microsoft's dominance in enterprise software.