In Outlook, click File; click Add Account.
In the Account Setup screen, enter the email account of the shared/proxy mailbox in the Email address field and click Connect.
When prompted for a password, do not enter your own password. Instead, click ‘Sign in with another account’.
Enter your own SU email address and click Next.
Enter your own SU password and click Sign in. Sometimes after you complete this step, it will go back to Step 3. If that happens, click 'Sign in with another account' again, then click your account when it appears to complete the process.
Verify that the setup completed with “Account successfully added”; click Done.
For personal devices (not an SU-owned computer)
Do not click the OK button on the ‘Stay signed in…’ screen.
Uncheck ‘Allow my organization to manage my device’.
Click 'No, sign in to this app only'.
Close and reopen Outlook; your shared/proxy mailbox should be on the left pane below your current account.
