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If you want to redirect your email from your old @cam Exchange Online email account to your new @medschl account please follow the link to this Cambridge UIS webpage explaining how to do it (Go to the section titled "Forwarding (redirecting) your email")
https://help.uis.cam.ac.uk/service/email/hermes/webmail/redirect-and-vacationforwarding-in-exchange-online
You can also permanently change your email address by adding your @medschl email address to your profile on the University Lookup Service