1.- Open Microsoft Outlook and select "Options..." from menu "Tools".
2.- Select tab "Mail Format " click on "Signatures..."

3.-On the window "Create Signature" click on "New...".

4.- Write the name for your signature on the first filed and then select "Use this file as template:" and write "C:\signature.htm" (without quotations marks) on the text box

5.- Click on "Next >" and close every open window by clicking on "OK".