Sorting and writing your emails faster with AI
Gmail and Outlook include AI assistants that summarise, sort and write your emails. The method to make the most of them without losing control.
Your inbox is overflowing and both Gmail and Outlook now offer an AI assistant to tame it. Summarising a 40-message thread, drafting a reply, finding the important email buried in notifications: these assistants save real time, provided you know where to bring them in — and where not to.
What AI really does well on your emails
AI excels at three specific tasks: summarising, prioritising and drafting a first version. It is not made to decide for you what matters.
Concretely, Gemini in Gmail summarises long threads, groups messages by topic and pushes urgent tasks to the top of the inbox, according to Google’s official documentation. Copilot in Outlook shows a summary of an email or a conversation in a few seconds, with clickable citations that link back to the source message, and can synthesise the content of an attachment. Both also offer writing help: you describe what you want to say, the assistant produces a draft you adjust. These two assistants are part of a broader family of tools built into the office suite and the browser.
Gmail (Gemini) vs Outlook (Copilot): what sets them apart
| Feature | Gmail + Gemini | Outlook + Copilot |
|---|---|---|
| Long-thread summary | Yes, by topic | Yes, with citations to each message |
| Attachment summary | Limited | Yes |
| Assisted writing | “Help me write” | Writing + tone adjustment (formal, friendly, concise) |
| Suggested replies | Yes, contextual | Yes, with draft review (clarity, tone) |
| Automatic sorting / prioritising | Grouping by theme, suggested tasks | Agentic inbox triage in gradual rollout |
| Language availability | Basic features broad, some advanced features in English first | Available in many languages on all three Outlook versions |
The 5-step method
1. Start with the summary, not the sorting. On a long thread or an inbox overflowing after time away, first ask for a summary before handling messages one by one. You gain the context without rereading everything.
2. Let AI draft, never the final send. Describe the message in one sentence (“tell them I can do the 14th but not the 15th, offer an alternative slot”) and let the assistant structure the reply. Always reread before sending: a poorly calibrated tone or a misunderstood detail is fixed in ten seconds on review, not after the send.
3. Adjust the tone rather than rewriting everything. Both tools let you tweak a draft (more direct, more formal, shorter) without starting over. It is faster than fixing a badly-toned text yourself.
4. Create templates for recurring replies. Appointment confirmation, invoice reminder, standard reply to a frequent request: a reusable prompt saves more time over the long run than case-by-case writing.
5. Keep automatic sorting under watch. Grouping by topic and suggested tasks are useful, but an algorithm can misfile a sensitive message. Check manually for a few weeks before relying on it entirely.
What not to delegate
An email with legal stakes (a negotiation, a customer complaint, an HR matter) deserves your full reread, not a mere glance at a generated draft. And before pasting the content of a sensitive email into an assistant, keep in mind the confidentiality habits at work: not all plans handle your data the same way. If you write a lot by email, the question of keeping your style also arises: the same principles as for writing with AI without losing your voice apply to your professional correspondence.
Key takeaway
AI in your inbox saves time on three specific tasks: summarising, prioritising, drafting a first version. It does not replace your judgement on what matters, nor your reread before sending. Start with long threads and repetitive replies, keep an eye on automatic sorting, and the time saving quickly becomes tangible.
Sources
Frequently asked questions
Can AI reply to my emails automatically without my approval?
No, not by default. Gemini in Gmail and Copilot in Outlook generate drafts or reply suggestions: you review and send. More autonomous features exist (agentic inbox triage on the Copilot side), but they remain gradual and framed.
Are my emails used to train Google's or Microsoft's AI?
Professional plans (Workspace, Microsoft 365) generally exclude your data from model training, unlike some consumer plans. Check the terms of your plan before scaling up the use.
Does Gemini work in other languages in Gmail?
The basic features (writing help, suggested replies) are available in several languages, but some advanced features like automatic per-thread summaries were first rolled out in English before a gradual extension to other languages in 2026.
Does Copilot in Outlook require a specific subscription?
Yes, Copilot in Outlook is a paid feature, generally included in a Microsoft 365 Copilot licence. The summary and assisted-writing features are available on New Outlook, classic Outlook and Outlook on the web.
Should you let AI sort your whole inbox automatically?
Not without supervision at first. Automatic sorting and suggested tasks are useful, but an important email misfiled can go unnoticed. Keep manual control the first few weeks, time to check how reliable the sorting is on your own inbox.