Shared accounts/mailboxes are accessible to more than one user, and can be used for a specific project, task, or department. Access to a shared account can be set up either by:
A security group (, where a user with permission for the account would use can their own credentials to access the account).
a A linked account (, where the user with permission for the account would can use the credentials of the generic account.
Adding a shared mailbox to Outlook (Classic)