We all know how annoying it can be to open Outlook on a computer that we don’t normally use and find that our default signature is not available. If you will be using this computer more often or it is your replacement computer, it might be handy to copy the signature file from your old computer to your new one.
Windows XP, C:\Documents and Settings\username\Application Data\Microsoft\Signatures
Windows Vista and 7, C:\Users\username\AppData\Roaming\Microsoft\Signatures
Copy the three files with the name of the signature and extensions .htm, .rtf, and .txt to the new computer in the same location.
You may have to turn this signature on as the default on the new computer. This is found in the Signature settings. From there you can e-mail away.