Some clients use contact groups to send e-mail correspondences. While you have to enable this feature in Outlook on Mac OS X, it is a pretty straightforward process.
Step-by-step Guide
Mac OS X
Step 1: Open the contacts pane by clicking the icon at the bottom right of the Outlook Window that looks like two people.
Step 2: Make the "New Contact Group" button clickable.
The "New Contact Group" button is grayed out initially in Outlook
Step 3:
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