How to Send an Email to All Contacts in an Address Book in Outlook Expressby Kristen WatersUpdated September 15, 2017
In order to facilitate the sending of a single email to a large number of contacts, Outlook Express allows you to create groups. You can create a group that contains a small portion of your contacts or every contact in your Address Book. Once the group is created, Outlook Express will treat it as if it is a single contact.
Open the Outlook Express application. It will be found under the "Start" menu.
Click on the "Addresses" button at the top of the window. The Address Book window will appear.
Click the "New" button at the top of the Address Book window.
Choose the "New Group" option. A Group dialog window will appear.
Type a name for the group in the Group Name text box.
Click the "Select Members" button.
Select all the contacts on the left side of the window, then click the "Select->" button.
Close the Group window and the Address Book window.
Click the "Create Mail" button.
Click the "To" button and choose the group created.
Compose the email and send as usual.