IMPORTING A GROUP VCARD INTO ADDRESS BOOK
This guide assumes you have been sent a Group VCard containing names and email addresses of people you need to be able to send emails to on a regular basis. This applies to you if you use Mail and Address Book for your emails.
First, open Address Book.
Click View -> Groups to make sure you are seeing all of the groups.
Click the plus sign in the bottom left of the window.
Enter the name for your new group (ex. Teachers)
Click File -> Import
Select the Group VCard that was sent to you.
Click 'Last Import' at the bottom of the list.
Select all of the members that have been imported. (Hint: selecting one of the members and then pushing command-A selects all of them)
Click and drag the contacts into your new group.
Done! You should now be able to create a new email and just type the name of the group to send it to all of the members of that group.
NOTE: You may have to quit and re-open Mail for it to recognize your new group.