How do I use an AI email writer for Outlook in 2026?

You can use an AI email writer for Outlook by installing a third-party add-in like Grammarly, Jasper, or Microsoft's own Copilot, then opening the assistant from the compose window and describing what you want to say. The AI drafts the email, and you review, edit, and send it like normal. Here's the thing most people miss: the AI doesn't need a perfect prompt. You can type something as rough as 'tell Sarah the report is late but I need her data by Thursday' and the tool will expand that into a professional message. I've found that starting with a messy brain-dump works better than trying to sound polished from the start. The real value isn't the writing itself. It's the time you save staring at a blank screen. Outlook's built-in Copilot (available with Microsoft 365 Copilot subscriptions, around $30/user/month) works directly in the ribbon. Third-party tools like Grammarly's AI writer or Flowrite plug in via the Outlook add-in store. One tip that's saved me repeatedly: always read the draft out loud before sending. AI tends to add extra words and formal phrasing that sounds off in a quick work email. Trim anything that feels stiff. Also, set up a few custom tone presets if your tool supports them — 'casual team update' vs 'client follow-up' makes a big difference. For a deeper dive, see our guide on how to write AI prompts. **Related**: Is Outlook Copilot worth the cost? | Can AI write emails in my own voice?