If you want to replace an existing mailbox, you'll need to disconnect the current one.
Here you can find detailed instructions: How do I disconnect or remove my mailbox?
Now you'll need only to Add Mailbox:
If you want to replace an existing mailbox, you'll need to disconnect the current one.
Here you can find detailed instructions: How do I disconnect or remove my mailbox?
Now you'll need only to Add Mailbox: