Outlook users can delegate management responsibility of their Outlook calendars and email. Once delegation is granted to another user, a delegate has the ability to send out "On Behalf Of" owner meeting proposals and email messages. "On Behalf Of" is displayed on the email, responses are sent back to the owner of the request, unless Entourage is set to redirect the responses to the delegate.
When sharing your Outlook account this only grants viewing capabilities.
Warning: Use caution when setting the permissions on your personal calendar. If you set your personal calendar's "Default" account permissions incorrectly, you will expose your calendar to all YaleConnect users on campus.