It’s important to understand that Microsoft Teams handles HTML content differently depending on how it’s presented. Here’s a breakdown of the situation and how to approach it:
Why HTML Files Aren’t Directly Rendered as Emails in Teams:
For viewing the content of a saved HTML file, download it and open it in a web browser.
Teams is a Collaboration Platform:
Teams primarily focuses on chat, file sharing, and collaboration. While it integrates with Outlook, it doesn’t replicate the full email client experience within its chat interface.
Security Concerns:
Directly rendering arbitrary HTML could pose security risks. Teams has to balance functionality with protection against malicious code.
Rendering Differences:
HTML rendering can vary across different applications. Teams might not have the same rendering engine as a dedicated email client.
How to Approach Viewing HTML Email Content in Teams:
If the HTML is from an Email Sent to a Teams Channel:
When an email is sent to a Teams channel, Teams attempts to display the content. However, complex HTML or elements that Teams doesn’t support might not render correctly.
Sometimes, Teams will display the raw HTML code instead of the rendered version.
Factors that can affect this are:
Complex CSS.
JavaScript.
External image links that are blocked.
Malformed HTML.
Viewing the HTML File:
If you’ve uploaded an HTML file directly to Teams, it will generally be treated as a file.
To view it as intended, you’ll likely need to:
Download the file: Download the .html file from Teams.
Open in a Web Browser: Open the downloaded file in a web browser (like Chrome, Firefox, or Edge). This will render the HTML as a webpage.
Outlook Integration:
For actual email viewing, rely on the Outlook application or Outlook on the web, which are designed for that purpose. Teams integrates with Outlook, so you can access your emails through those applications.
In summary:
Teams isn’t designed to be a full-fledged HTML email rendering engine.
For proper HTML email viewing, use Outlook.

