We currently have "email address" as the subscriber key in Marketing Cloud.
Lets say we have Bob Smith already has a subscriber in the system:
Email: firstname.lastname@example.org - First Name: Bob - Last Name: Smith - Company: Company A
But then we subscribes again, through a different channel as a mistake or he doesn't realize he's already signed up, but some of his profile information has changed but not his email:
Email: email@example.com - First Name: Bob - Last Name: Smith - Company: Company B
How does Marketing Cloud handle this? Will the second entry bump out the first?