At Queen's there are several options available for mailing lists.
Create a Contact Group when you are sending email to a group of people or you need to schedule a meeting with the same group of people
When you send email to a Contact Group, the To: field on received messages shows the individual email addresses of all members of the list. If you want to hide the membership of the list, use the Bcc: field instead of the TO: field when sending email to the group. If Bcc is not currently visible when you are sending email, from the top menu click the ... and select Show Bcc.
Note that Contact Groups that you create in Office 365 will also be available to use in Outlook 2010 and Outlook 2013.