Changing default apps on Windows 11 is not the same with that on Windows 10. As the default email app on Windows 11 is set as Outlook App, some users may want to change to Gmail or other preferred email apps but without a quick method. We will tell you how to change default email app on Windows 11 in several seconds.
Totally there are 2 methods: via Windows 11 system and via browsers.

Method 1: How to Change Default Email App on Windows 11 via System Setting?
Only 4 steps needed to change your default Outlook email app to others:
Step 1: Click Start icon and choose Settings;
Step 2: Click on Apps and select Default Apps;
Step 3: Type in the name of the email in the search menu bar and click on it to set up as the default email client;
Step 4: Click MAILTO button and set the new default email app;
Till now, you have finished the set up of changing default email app on Windows 11. Whenever you try to open email by clicking on any “mailto:” links, your default mail app will pop up.
Method 2: How to Change Default Email App on Windows 11 via Browser?
We will mainly introduce you 2 browsers’ setting to change default email app.
Google Chrome:
Step 1: Create an account or sign in to Gmail;
Step 2: Navigate to the Settings and select Privacy and security, and choose Site settings under it;

Step 3: Choose and click Additional permissions and select Protocol Handlers;

Step 4: Select Sites can ask handle to handle protocols radio box, and remove the Gmail protocol from Not allowed to handle protocols.

Step 5: Go back to Gmail account and select Allow.

Now, your emails will be opened via Gmail, instead of other email apps.
Mozilla Firefox:
Step 1: Open Firefox and click on Settings > Search;
Step 2: Search for the mailto option;

Step 3: Click on it and there will be a drop-down menu, just choose the one that you want to make default.

Then all you have done to change detail email apps on Windows 11 system.