Internal emails from Microsoft executives, recently released as part of the DOJ's antitrust case against Google in 2019, reveal that Microsoft's decision to invest in OpenAI was significantly influenced by concerns about falling behind Google in AI development. The emails, addressed to Satya Nadella and Bill Gates, highlight Microsoft Chief Technology Officer Kevin Scott's worries about the AI model-training capability gap between Microsoft and Alphabet Inc., Google's parent company. This concern prompted Microsoft to collaborate with OpenAI, a move described as being driven by a sense of lagging behind Google.