To remove your old e-mail account from Outlook, please proceed as follows:
3. Select your new Exchange mailbox by clicking on the name of the new mailbox. The Exchange mailbox has the address “[…]@uni-mannheim.de” or “[…]@students.uni-mannheim.de” in the name “column” and “Microsoft Exchange” in the “type” colum. Then click on the “Set as default” button.