Copilot in Outlook is designed to reduce time spent reading and writing email by using AI to summarize message threads and generate drafts grounded in the current email context. Microsoft guidance for Copilot in Outlook highlights core capabilities such as drafting replies that reflect the conversation tone and content, and summarizing email threads or inbox content so users can quickly understand what requires action.

Option B is correct because Copilot can generate a draft reply based on the context of the email conversation, helping you respond faster while keeping the response aligned to what was discussed. Option C is correct because Copilot can summarize emails—such as unread messages or a thread—by extracting key points, requests, decisions, and suggested next steps, which supports rapid triage.

Option A is not a Copilot task; inserting or customizing an HTML signature is a standard Outlook configuration feature. Option D is also a traditional Outlook management function and is not an AI drafting/summarization capability.

Therefore, the two tasks you can achieve with Copilot in Outlook are drafting responses and summarizing unread emails .