Outlook doesn’t offer a built-in function to export the signature. If you are getting a new computer or when you want to share your Outlook Signature as a template with your co-worker, you might want to export the Outlook signature. You can now make the changes to your signature when done simply click Ok.The steps to edit the signature are pretty much the same as creating a new signature: Sometimes you need to edit your signature in Outlook, to change your telephone number for example.
If you want to set another signature as your default signature, then click on Signatures… and change the default signature for new and reply messages as described earlier.
Click on Signatures in the toolbar and select Signatures… from the dropdown menu