Microsoft; Chelsea Jia Feng/BIIn September 2023, Microsoft's famously soft-spoken CEO, Satya Nadella, unveiled the company's flagship AI product, Copilot, with sweeping fanfare. "Copilot will fundamentally transform our relationship with technology," he declared. The AI assistant, he predicted, would give birth to an "era that uplifts every person, industry, community, and country."Now, a year after Copilot's release, the reviews — both inside and outside Microsoft — indicate that the new product is struggling to live up to the hype.