The network connection is one of the possible reasons for problems when adding an account to Outlook. In this case, disconnecting and reconnecting the internet connection can help to fix this issue.
Offline storage table (OST) and personal storage table (PST) are two different Outlook data files used to store a copy of mailbox items on local storage. Outlook creates a PST file when you add a POP3 ...
Adding another mailbox to your account on Outlook is a straightforward process, provided you have the required permissions or are happy to use another account to gain access to the mailbox.