In this article you will learn how to customize the Zimbra favicon, for example with your company logo making it more recognizable for your users.
Here is a screenshot of the default Zimbra favicon:
To customize the favicon, replace the existing favicon.ico with custom one in the folder:
Then for Modern UI replace the existing favicon.ico with custom one in the folder:
Then clear the cache of the server and restart the mailboxd service as the user zimbra. (You also need to flush your browser cache.)
zmprov fc all zmmailboxdctl restart
Finally see the result: