Well I've previously set up a group called "Work addresses" and find that if I highlight the group in address book by single-clicking on it and then hit the compose button it loads in the two email addresses in that group into the "To" field. Is that what you mean? To make a group: 1. Create a new contact group by hitting the "Create new contact group" button - unhelpfully just labelled "+" in the bottom left corner - type a name in and hit Enter. 2. Drag'n'drop contacts from your contacts list into the new group - they're copied in not transferred, and hence remain in the main list. You can also just start a new email conventionally then type the group name in the recipient boxes. The "gear" button can then be used to rename or delete a group. If you delete a group the contact isn't lost since the one in the main listing remains.