When using Outlook 2011 you have the ability to create an e-mail signature. An e-mail signature will be what appears at the bottom of every e-mail sent from your account. The following documentation will show how to create this signature using Outlook 2011 for Mac.
Wile creating an e-mail message in Outlook, select Edit Signatures... from the Signature drop down menu (pen and paper icon).
Your new signature will be labeled Untitled. Double-click the name and enter a new title for your signature.
In the Signature textfield put in the text that you desire for your signature.
Close the Signatures window.
You can now insert your signature by selecting it from the Signature drop-down menu, as shown to the left.
To have your created signature automatically put into all messages: