deploy corporate signature via vbs

I everyone,
have a win 2003 domain and client 7 64-bit .

WE office changed through an office of 365 , I found the Following Link :

http://www.howto-outlook.com/howto/corporatesignatures.htm

Building a business signature and deploy via GPO with vbs files.

The script works well,
but when the user logged, at first time open outlook and try to send new email the signature doesn't appare.
Then i click  file, Options , Mail, and then signing,i see here is a disabled possibility of rate changes and set the signature by design.
than i go back to email reopen "write new messages" only after this steps see the new signature.

ANY suggestion ..