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Sometimes you may want to send the same instant message to more than one contact. For example, you might instant message several contacts in your department about an upcoming conference call, or you might instant message your department group about food being served in the break room. You can include people with Yahoo! IDs who are in your address book but not on your Messenger List. (They must be Messenger users.)
Tip: You can’t include Windows Live™ Messenger contacts in your message.
Yahoo! Messenger lets you:
When you message multiple contacts, including groups, you write your first message in the Send Message to Group window, which includes all of the selected contacts. When you click the Send button, each contact receives your message. A separate IM window opens on your screen for each reply, and you continue your conversation with each individual separately from the others. You’re no longer messaging the group as a whole.
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To instant message multiple contacts from your Messenger List:
In your Messenger List, select two or more contact names. Your selection can include group names as well as individual contacts.
Tip: When making multiple selections, Shift-click to select a range, or Ctrl-click to select randomly.

Right-click, then select Send an Instant Message.

Tip: If your last selection is a group, the menu option reads Send Instant Message to All in Group.
The Send Message to Group window opens.
In the Group window, type your message, then click the Send button.

A separate IM window opens for each contact who responds.
To instant message multiple contacts from your Messenger List and address book:
Select Send an Instant Message from the Actions menu.
The Send an Instant Message window opens.
In the My Contacts tab of the Send window, select the contacts you want to instant message, including those under your Address Book Contacts, then click the OK button.

The Send Message to Group window opens.
In the Group window, type your message, then click the Send button.
If you want to send a message to a group, select the group in your Messenger List, then right-click and select Send Instant Message to All in Group.
Instant messages include smart tags, a feature that identifies phone numbers and email addresses. Learn how to use smart tags to add information to your address book or as another way to initiate a communication.