When setting up IMAP accounts with Microsoft Outlook for macOS with the option "Synchronize with Microsoft Cloud" enabled by default, passwords and e-mail content are forwarded to the Microsoft Cloud (see Heise). This means that sensitive data is no longer confidential, but is transmitted to Microsoft.
If you have used the "Synchronize with Microsoft Cloud" function in Microsoft Outlook for macOS to access e-mails from the university e-mail accounts via IMAP, deactivate this function immediately. You should also change the passwords of all e-mail accounts that you have integrated via IMAP. 
Further information on transferring data to a cloud via the e-mail program can be found here.