Microsoft announced full-scale integration of its AI assistant Copilot across Windows, Office 365, and Teams ecosystems starting November 2025. The rollout enhances contextual command execution, summarisation, and workflow automation capabilities. The company aims to embed generative AI deeply into enterprise productivity stacks to defend market share against Google Workspace AI and Anthropic integrations. Early trials indicate improved user retention and enterprise adoption rates. Analysts expect strong Q4 earnings contribution from Copilot subscription upgrades as Microsoft scales its paid AI ecosystem globally.