By creating a signature you can automatically include your contact information in your e-mail. You can even create different versions of your signature for replies or forwards.

• Open Outlook
  
  
• Click the File Tab 
             
• Click Options
  
  
• Click Mail / Signatures
                 
• Click New (Enter a signature name, such as "Work" or "Personal")

                                                      

• Type out your custom signature (With the text highlighted, you can apply the font, size and formatting as desired)
                                     
                       
  
• Click OK
  
  
• Under Choose default signature, you can choose to apply your signature to New messages and/or Replies/forwards by clicking the drop down arrow beside New message or Replies/forwards.
                                                          
• Click OK 
  
  
• Click OK to close the Outlook Options Window