You draft a reply in Outlook and click the Copilot icon to generate a suggested response. The AI writes a full paragraph, but it does not match your intended tone or message. You want to discard the generated text and return to your original draft without losing any unsaved work. This article explains the exact steps to undo a Copilot-generated reply in Outlook and restore your previous draft.
When you use Copilot in Outlook to draft a reply, it replaces the current content in the message body with its generated suggestion. The undo action is the fastest way to revert that change. The Copilot pane also offers a manual revert option if you prefer not to use the keyboard. Understanding both methods ensures you never send a reply that does not reflect your voice.
This guide covers how to roll back a Copilot-generated reply using the Undo command, the Copilot pane, and keyboard shortcuts. It also explains what happens to your original draft and how to avoid common mistakes.
Key Takeaways: Undoing a Copilot-Generated Reply in Outlook
- Ctrl+Z (Undo): Reverts the Copilot-generated reply and restores your previous draft in the message body.
- Copilot pane > Discard button: Manually removes the generated suggestion and returns to the original draft without using the keyboard.
- Outlook web app > Copilot icon > Show original draft: Restores your pre-generated text if the Undo action is not available.
Why Copilot Replaces Your Draft
When you use Copilot to generate a reply in Outlook, the AI writes a new message body based on the context of the original email and your instructions. Copilot does not append the generated text below your existing draft. It replaces the entire content of the message body with its suggestion. This behavior is by design because Copilot assumes you want a complete, polished response rather than a partial edit.
Your original draft is not permanently lost. Outlook stores the state of the message body before the generation. The Undo command or the Copilot pane can restore that state. The key is acting before you send the reply or close the email window. Once you send the email or close the compose window without saving, the original draft is gone.
How the Undo Command Works in This Context
The Undo command in Outlook reverses the most recent action. When you generate a reply with Copilot, that action is recorded as a single edit. Pressing Ctrl+Z or clicking the Undo button in the Quick Access Toolbar removes the generated text and restores the previous content. This works regardless of whether you typed a draft before using Copilot or started with an empty message body. If you started with an empty body, Undo clears the generated text and leaves the message body empty.
Steps to Roll Back a Copilot-Generated Reply
Follow these steps to discard a Copilot-generated reply and return to your original draft. The steps apply to Outlook for Microsoft 365 desktop app and Outlook on the web.
- Press Ctrl+Z immediately after generation
After Copilot inserts the suggested reply, press Ctrl+Z once. This reverts the message body to the content that existed before the generation. If you had a draft, that draft reappears. If the body was empty, it becomes empty again. Do not click anywhere else before pressing Undo. Any other action, such as typing a single character or clicking a formatting button, changes the undo history and may prevent a full revert. - Use the Copilot pane if Ctrl+Z does not work
Open the Copilot pane by clicking the Copilot icon in the toolbar. In the pane, click the Discard button. This removes the generated suggestion and restores the previous message body. This method works even if you have performed other actions after the generation, because the Discard button specifically reverts the Copilot-generated content rather than the last edit. - In Outlook on the web, use the Show original draft option
If you are using Outlook on the web and the Discard button is not visible, click the Copilot icon in the message body toolbar. Select Show original draft from the dropdown menu. This restores the text you had before Copilot generated the reply. This option appears only if you had existing content in the message body before using Copilot. - Close the compose window without saving
If you have made additional edits after the generation and cannot revert, close the email compose window. When Outlook prompts you to save changes, click Discard or Don’t Save. This discards all changes made since you opened the compose window, including the generated reply and any subsequent edits. Your original draft is lost if it was not saved as a draft before you started. To avoid losing work, save your draft manually before using Copilot by pressing Ctrl+S or clicking File > Save.
Common Issues When Rolling Back a Copilot Reply
Ctrl+Z does not revert the generated text
This happens when you performed another action after the generation, such as typing a single character, applying formatting, or clicking a different part of the message. The Undo command reverses only the most recent action, which may no longer be the Copilot generation. To fix this, use the Copilot pane Discard button instead. If the Discard button is not available, close the compose window without saving and reopen the original email to start fresh.
The Copilot pane does not show a Discard button
The Discard button appears only while the Copilot-generated reply is the current content in the message body. If you have edited the text or switched to a different email, the button disappears. In Outlook on the web, the Discard button may also be absent if the Copilot feature is not fully loaded. Refresh the browser window, reopen the email, and click Reply again. Then use the Copilot icon in the toolbar to generate a new reply or select Show original draft if available.
The original draft is lost after closing the window
Outlook does not automatically save drafts of replies that were never saved. If you close the compose window and click Discard, any unsaved text is lost. To prevent this, save your draft manually before using Copilot. Press Ctrl+S or click File > Save. Outlook saves the draft in the Drafts folder with the subject line prefixed by your original draft. After saving, you can safely use Copilot and revert using Undo or Discard without losing your work.
Copilot-Generated Reply vs Manual Draft: Key Differences
| Item | Copilot-Generated Reply | Manual Draft |
|---|---|---|
| Content origin | AI writes based on email context and your prompt | You type manually |
| Presence in message body | Replaces all existing content | Appears as you type |
| Undo behavior | Ctrl+Z or Discard reverts to pre-generation state | Ctrl+Z removes last typed characters |
| Draft saving | Not saved until you manually save the email | Auto-saved if you have Outlook drafts enabled |
| Restoration after close | Lost unless saved as a draft before generation | Retrieved from Drafts folder if auto-saved |
Rolling back a Copilot-generated reply in Outlook is a quick process when you use the Undo command or the Copilot pane Discard button. The key is acting before you make any other edits or close the compose window. If you need to regenerate a reply, save your draft first so you can revert without losing your original text. To avoid accidental sends, review the generated reply carefully before clicking Send. For frequent users, the Copilot pane provides a more reliable revert method than relying solely on Ctrl+Z.