Prevent disruption for your customers and end users when the temporary redirection of legacy Salesforce domains ends. To help your users update outdated links and bookmarks, show a brief message during the redirections that provides the updated URL. Then update references to your previous Salesforce URLs, including site URLs and URLs that contain your Salesforce instance but not your My Domain name.
Where: This change applies to Lightning Experience and Salesforce Classic in Group, Essentials, Professional, Enterprise, Performance, Unlimited, and Developer editions.
When: Salesforce stops the redirections for these hostnames in Winter ’25. The deployment of that release is scheduled to start in August 2024 for sandboxes and in September 2024 for production.