When you forward a message under Outlook, any attachments included in the original message will be forwarded too.
In the Respond group on the Home Tab or Message tab, click Forward.
Enter the recipients in the To, Cc or Bcc fields.
Edit your message.
If you want to forward multiple messages to recipients in the form of a single message.
Click on Mail and while holding the CTRL key down, select the messages of your choice. On the Home tab, in the Respond group, click on Forward. The messages will be forwarded as attachments for your new message.