In short
Select the email text, press Alt+1 and ask Zack KI for a summary or reply draft. You do not need a Microsoft 365 subscription with Copilot.
Reply to an email with AI
- Select the part of the incoming email that matters.
- Press Alt+1 and write what you want to say: accept, decline, ask a question.
- Click into the reply field in Outlook, return to Zack KI and choose Insert.
What works in Outlook
- Summarise a thread: select text, press Alt+1, choose Summarize.
- Draft a reply: give your key points and preferred tone.
- Correct your text: select it and press Alt+4. Alt+3 improves the wording.
- Check an attachment: save it, select it in Explorer and press Alt+1.
New Outlook, classic Outlook and webmail
Zack KI uses selected text in classic Outlook, new Outlook and webmail. Inserting a reply requires an editable reply field.
Mailbox and calendar access
Microsoft 365 Copilot can use your mailbox and calendar. Zack KI only receives the text and files you provide.
Sources: Microsoft: Draft an email with Copilot in Outlook, Microsoft 365 plans, status 17 October 2026.
Related questions
Does Zack KI read my mailbox?
No. Zack KI only uses the text or files you select and send. Your chats are stored locally on your PC.
Can I set a standard greeting?
Yes. Put it in your custom instructions for chat drafts, or in a chip’s instruction for text actions.