G'Day SNaylor,
The only way I know to do this is to create an e-mail Template:
File>New, and click Mail Message.
When the new message opens, give it an appropriate subject and
ADD THE RECIPIENTS IN THE BCc: area!
Compose any fixed content, leaving blank space for information
that you compose when you send the message later.
File>Save As. In the "Save as" type list, click "Outlook Template",
and then click Save.
To send the message:
Select the Inbox folder in Outlook.
Tools>Forms, and then click "Choose Form".
In the "Choose Form" dialog box, click the "Look in" drop-down, and
select "User Templates in File System".
Select your Template, and then click Open.
You will see your "distribution list" already in the BCc: area.