We have made several improvements around contact email management in the system:

Booking updates: You can now easily change the contact or guest on a booking by clicking on their email. A pop-up dialog will appear, allowing you to create or select a different contact to be replaced instead.
Contact email updating: You can also update contact emails more smoothly than before. Previously, if a contact had logged into their account, we restricted your ability to edit their email for security reasons. Now, it just works!
Duplicate merging: When you update a contact's email, if the new email is associated with an existing contact, you will get a prompt to merge the duplicate contacts.

Cademy changelog

Contact Email Updating & Duplicate Merging