How to Change the Default Browser in Outlook
When you click a link inside an Outlook email, Outlook doesn't decide which browser opens it — your operating system does. But there's a catch: depending on your version of Outlook, your OS, and how your system is configured, the path to changing that behavior looks different. Here's what's actually happening under the hood, and what controls it.
Why Outlook Doesn't Directly Control Your Browser
Outlook passes hyperlinks to the OS, which then opens whatever browser is registered as the default browser at the system level. This means there's no setting inside Outlook itself labeled "choose a browser." If you're seeing links open in a browser you didn't expect, the fix lives outside of Outlook — usually in Windows Settings or macOS System Preferences.
This is a common source of confusion, especially after a Windows update or a new browser installation that silently resets your default.
How to Change the Default Browser on Windows (10 and 11)
This is where the vast majority of Outlook users will find their fix.
Windows 10:
- Open Settings → Apps → Default apps
- Scroll to Web browser
- Click the current browser shown and select your preferred browser from the list
Windows 11:
- Open Settings → Apps → Default apps
- Search for or scroll to your preferred browser
- Click on it and set it as default — Windows 11 requires you to assign it per file type (HTTP, HTTPS, etc.), which is more granular than Windows 10
⚠️ On Windows 11, you may need to individually set the browser for HTTP, HTTPS, and .htm/.html file types. Simply clicking "Set as default" on the browser's own page in Settings often handles this automatically, but it's worth confirming each one if links still misbehave.
How to Change the Default Browser on macOS
For Outlook users on Mac:
- Open System Settings (or System Preferences on older macOS versions)
- Go to Desktop & Dock → scroll to Default web browser (on newer macOS), or search "default browser"
- Select your preferred browser from the dropdown
Alternatively, you can set this from within the browser itself — most major browsers (Safari, Chrome, Firefox) have a "Set as Default Browser" button in their settings or preferences panel.
What About the Outlook Web App (OWA)?
If you're using Outlook in a browser rather than the desktop app, the behavior is different. Links clicked in OWA open in a new tab within the same browser you're already using. The "default browser" concept doesn't apply here — the browser you use to access OWA is effectively the browser handling everything.
The New Outlook for Windows — A Different Consideration
Microsoft has been rolling out a new Outlook for Windows, which replaces the classic desktop client for some users (particularly on Windows 11). The new Outlook is essentially a web-based wrapper, which means it behaves more like OWA than the traditional app. In some configurations, links may open in Microsoft Edge by default regardless of your system default browser setting.
This is an area where system defaults and app-level behavior can conflict, especially in enterprise or Microsoft 365 managed environments where IT policies may override personal settings.
Variables That Affect Your Outcome 🔧
Several factors determine exactly what steps you need to take and whether those steps will fully resolve the issue:
| Variable | Why It Matters |
|---|---|
| Outlook version | Classic desktop vs. new Outlook vs. OWA each behave differently |
| Windows version | Windows 10 vs. 11 have different default app configuration flows |
| Microsoft 365 or standalone | Enterprise M365 deployments may have IT-enforced browser policies |
| Browser installed | The browser must be properly installed and registered with the OS |
| Recent OS/app updates | Updates can reset default browser settings without warning |
| Device ownership | Work-managed devices may restrict which defaults you can change |
When Changing the Default Browser Doesn't Fix It
If you've updated your default browser and Outlook links still open in the wrong browser, a few things may be at play:
- Microsoft 365 group policies in a workplace environment can enforce Edge for all Office app links
- The new Outlook may have its own internal link-handling behavior separate from OS defaults
- Your browser installation may not have properly registered itself with Windows — reinstalling or running the browser's built-in "Set as Default" prompt can resolve this
- Some email link types (like mailto: links) are handled separately from HTTP links and may need their own default app assignment
What "Default Browser" Actually Controls
It's worth being clear about scope: setting a default browser controls where HTTP and HTTPS links open — standard web addresses. It does not affect:
- Mailto links (those open in your default email app)
- Links to Office documents (those may open in Office apps or OneDrive depending on settings)
- Teams or SharePoint links in some enterprise setups (which may be intercepted by those apps directly)
Each of these has its own default app assignment, and users sometimes conflate them when troubleshooting.
The right approach for your situation depends on which version of Outlook you're running, whether your device is personally owned or managed by an organization, and which OS you're on. Those details change the path — and in some managed environments, they may change what's possible.