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.
4. Then select your old mailbox, by clicking on the name of the mailbox and then on the “Remove” button: