New Outlook Reply by Chat Settings: Location and Practical Limits

The new Outlook for Windows includes a feature called Reply by Chat that lets you respond to an email using Microsoft Teams Chat rather than a standard email reply. This feature appears as an inline button in the reading pane, but its settings are not located in the same place as most other Outlook options. Many users report difficulty finding the toggle to enable or disable this feature or understanding its limitations. This article explains where to find the Reply by Chat settings in new Outlook and describes the practical limits of this feature, such as recipient requirements and message formatting.

What Is Reply by Chat in New Outlook and How It Works

Reply by Chat is a feature available in the new Outlook for Windows (the modern version that replaces the classic Outlook client over time). When you open an email in the reading pane, a button labeled Reply by Chat appears in the toolbar area at the top of the message. Clicking this button opens a new Teams chat window directed at the sender of the email. The chat is pre-populated with a reference to the email subject line, but the email body is not included.

The feature requires that the sender is a Microsoft Teams contact within your organization or a federated external contact. It does not work for external senders who are not federated with your tenant. The chat is sent through the Teams client or the Teams web app, not through the Outlook email pipeline. This means replies sent via Reply by Chat do not appear in the email thread; they exist only in the Teams conversation history.

The feature is designed for quick, informal responses where a full email reply is unnecessary. It is not a replacement for email replies in formal or documented communications. The feature is enabled by default in new Outlook, but it can be disabled through a specific settings page that is not immediately obvious to most users.

Where to Find Reply by Chat Settings in New Outlook

The Reply by Chat setting is located in the Mail section of the new Outlook settings panel. It is not in the Ribbon, the File menu, or the View tab. Follow these steps to locate and change the setting.

1. Open new Outlook settings
   Click the gear icon in the upper-right corner of the Outlook window. The Settings panel opens on the right side of the screen.
2. Navigate to the Mail section
   In the Settings panel, click the Mail tab on the left side. This tab contains all email-related settings, including compose and reply options.
3. Select Reply by Chat
   Scroll down the Mail settings list until you see Reply by Chat. Click it. The panel displays a single toggle switch labeled Show Reply by Chat button.
4. Toggle the feature on or off
   Click the toggle switch to enable or disable the Reply by Chat button. Changes take effect immediately. No restart or save button is required.

When the toggle is off, the Reply by Chat button disappears from the reading pane toolbar. The feature is completely disabled until you turn it back on. There is no per-email or per-folder override; the setting applies globally to your Outlook profile.

Practical Limits of Reply by Chat

Understanding what Reply by Chat cannot do is as important as knowing how to turn it on. The feature has several hard limits that affect its usefulness in business workflows.

Recipient Restrictions

Reply by Chat only works when the email sender is a Teams contact within your organization or a federated external contact. If the sender is an external email address without Teams federation, the button appears grayed out or does not appear at all. The feature also does not work for distribution groups, shared mailboxes, or email addresses that are not linked to a Teams user account.

No Email Body or Attachment Forwarding

When you click Reply by Chat, the Teams chat window opens with only the email subject line as a reference. The body of the email and any attachments are not included. If you need to reference specific content from the email, you must copy and paste it into the chat manually. This makes the feature unsuitable for detailed technical discussions or document review workflows.

No Message Formatting or Rich Text

The Teams chat window opened by Reply by Chat supports plain text only. You cannot apply bold, italics, bullet lists, or other formatting to your message. The chat also does not support inline images or file attachments. For any communication that requires formatting or file sharing, a standard email reply or a full Teams chat is the correct tool.

Thread Separation from Email

The chat message sent via Reply by Chat does not appear in the original email thread. It only appears in the Teams conversation history between you and the recipient. If you need a written record of the reply within the email conversation, you must use the standard Reply button instead. This separation can cause confusion if team members rely on email threading for audit trails or project documentation.

No Delegate or Shared Mailbox Support

If you access a shared mailbox or act as a delegate for another user, Reply by Chat uses your own Teams identity, not the shared mailbox or the delegate account. The chat is sent from your personal Teams profile. This can result in the recipient seeing a reply from an unexpected sender. The feature is not designed for shared or delegated access scenarios.

Common Misunderstandings and Issues with Reply by Chat

Reply by Chat button is missing or grayed out

If the Reply by Chat button does not appear or is grayed out, first verify that the feature is enabled in Settings > Mail > Reply by Chat. If the toggle is on but the button is still grayed, the sender is likely not a Teams contact. Check the sender’s email address to confirm they are in your organization or are a federated external contact. The feature also does not work for emails in the Junk Email folder or the Deleted Items folder.

Reply by Chat sends a chat but the recipient does not see it

If the chat is sent but the recipient does not see it, the recipient may have their Teams status set to Do Not Disturb or may not have the Teams client running. The chat message will be delivered when the recipient becomes available. There is no delivery failure notification in Outlook. You must check the Teams conversation history to confirm the message was sent.

Reply by Chat opens Teams web instead of the desktop app

New Outlook defaults to opening Teams in the web browser if the Teams desktop app is not installed or is not running. To force the desktop app, ensure Teams is installed and running before clicking Reply by Chat. If the web version opens, you can copy the chat link and open it in the desktop app manually.

Reply by Chat vs Standard Email Reply: Key Differences

Item	Reply by Chat	Standard Email Reply
Recipient scope	Teams contacts only (internal or federated)	Any valid email address
Message format	Plain text only	Rich text, HTML, or plain text
Attachments	Not supported	Supported (files, images, links)
Thread location	Teams conversation history only	Email thread in the sent and received folders
Email body inclusion	Subject only, no body	Full original message included by default
Delegate or shared mailbox	Uses your personal Teams identity	Uses the shared mailbox or delegate identity

The table above summarizes the key differences between the two reply methods. Reply by Chat is faster for informal internal replies but lacks the features needed for formal or documented communication. Standard email reply remains the correct choice for most business correspondence.

You can now locate the Reply by Chat setting in new Outlook and decide whether to keep it enabled based on your workflow. If you frequently reply to internal emails with short, informal messages, the feature can save a few clicks. For all other scenarios, use the standard Reply button. As a practical tip, press Ctrl+Shift+R to open a standard email reply in a new window without clicking any toolbar buttons.