Microsoft is rolling out a new AI-powered feature called "Explain This" in Classic Outlook for Windows, which generates contextual explanations for text users highlight within an email. For example, selecting a term like "BSOD" will prompt Copilot to explain it using the email's content as context. Unlike other Copilot integrations, "Explain This" must be manually triggered, giving users control over when Copilot assists them. Microsoft noted in an admin portal update that this enhancement gives users greater control over when and how Copilot assists them, improving productivity, clarity, and decision-making directly within their workflow. Microsoft expects the feature to finish rolling out by the end of September, with most users having it by early September. A Microsoft 365 Copilot subscription is required for the feature to work. Additionally, Microsoft has finished rolling out "Copilot Settings" to everyone in Outlook Classic, accessible via File, which includes a toggle to turn off Copilot entirely and "Draft Instructions," turned off by default, that lets users give AI a better idea of how they like to write emails.