Send & Receive Issues

How to Open Outlook Web Replies in a Separate Window

Maira MehtabMaira Mehtab Nov 3, 2026 868 views

Question details

The user wants to configure Office 365 on the web so that all new emails and replies automatically open in a separate pop-out window.

How to Open Outlook Web Replies in a Separate Window
Product
Outlook on the web
Device & OS
not provided
Scenario
Composing new emails and replying to messages within the web browser version of Outlook.
Observed behavior
Currently, replies open within the same browser reading pane, and there is no native setting to force them to open in a separate window automatically.
Before you start

Log in to your Office 365 account and open Outlook on the web. Note that while desktop versions of Outlook offer automatic pop-out settings, the web version currently relies on a manual pop-out button for each message.

Solution 1Recommended

Use the Manual Pop-Out Feature for Emails

Since automatic pop-outs are not supported natively in Outlook on the web, use the built-in pop-out button for individual messages.

Microsoft has optimized Outlook on the web to operate within a single browser interface to reduce tab clutter. As a result, the web version lacks the specific toggle found in the desktop app that forces every reply to detach automatically. You must trigger this action manually per message.

1
Start a reply or new message

Click on 'Reply', 'Reply All', or 'New message' in your Outlook web interface to open the composition pane.

2
Locate the pop-out icon

Look at the top right corner of the email composition box for the 'Open in new window' icon, which looks like a small square with an arrow pointing out.

3
Detach the window

Click the icon. Your draft will instantly move into a new, dedicated browser window, allowing you to view your inbox and compose your message side-by-side.

Use the Manual Pop-Out Feature for Emails
Submitting Feedback to Microsoft: If an automatic pop-out setting is vital to your workflow, Microsoft encourages users to submit feature requests. You can do this by clicking the 'Help' icon (question mark) in the top right corner of Outlook on the web, selecting 'Feedback', and choosing 'I have a suggestion'.
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Frequently Asked Questions

Can I make the Outlook desktop app open replies in a new window automatically?

Yes. In the Outlook desktop application, click 'File' > 'Options' > 'Mail'. Scroll down to the 'Replies and forwards' section, and check the box that says 'Open replies and forwards in a new window'. Click 'OK' to save.

Why did Microsoft restrict the automatic pop-out feature in Outlook on the web?

Outlook on the web is designed to operate seamlessly within a single browser tab to streamline performance and reduce window clutter. For this reason, Microsoft currently restricts automated pop-outs in the web environment.

Are there browser extensions that can force Outlook web replies into a new window?

While some third-party browser extensions claim to modify Outlook web behavior, using them is generally not recommended due to security and privacy risks associated with granting third-party tools access to your email data.