unable to send and Received mail when user is out of office using 1 X USB

HI
we are using Windows 7 and we have recently upgraded office 2003 to office 2007 everything is fine except the outlook module. I am able to receive mails in Lan Network but unable to send and Received mail when user is out of office using 1 X USB Modem network .whenever I am trying to send any mails its giving me an error saying :preparing to Send Received

Even I Install the Outlook Security Certificate Version v 3 I checked Outlook Connection Seating All the thing are configure fine in outlook but it?s not working I have tried our All Available solutions but found nothing of use. Even I tried creating a new profile of user and Outlook

Anyone plz help.

Regards”
DILIP JHA