The default folder where Outlook email signature files are located is:
Windows XP: C:\Documents and Settings\%username%\Application Data\Microsoft\Signatures
Windows 8 / 7 / Vista: C:\Users\%username%\AppData\Roaming\Microsoft\Signatures
NOTE: If your Windows language setting is other than English, the path will be your language equivalent of the above, e.g. (Dutch): C:\Gebruikers\%username%\AppData\Roaming\Microsoft\Handtekeningen
