Click the Insert File button (the one with a paperclip on it) on the message window's toolbar and select File from the menu that appears.
The Insert File dialog box opens. Locate and select the file(s) you want to attach to your email message; then click the Insert button.
The file is attached. Click the Send button to send the message as normal.
The sent message displays a paperclip icon next to the recipient's name in the Sent Items folder.
INTRODUCTION
Suppose you're working on a project with a co-worker and want to email her a document that contains an updated version of the project schedule. In that case, you simply "attach" the document file to the email message; then, when the recipient receives the email, she can open the attached file on her own computer.
TIP
Dragging Attachments
Another way to attach a file to an email message is to click and drag a file from your computer (for example, from the My Documents folder in an Explorer Window) and drop it on your email message.
TIP
Forwarding Versus Replying
Suppose you receive an email with an attached file. If you reply to that message, the attachment in the original message is not attached to the reply message. If you forward the message, however, the attachment remains.