New computer & OS (Vista), Office & Outlook 2007, all updates.

When Outlook starts and attempts to send/receive GMAIL pop, I get a 'server
certificate invalid message'. Pressing 'okay' to the question 'do you want
to proceed' carries on and normally checks mail, no problems.

But is there a work around to either update the server certificate (it seems
to have expired in 2005), or to prevent the warning pop-up?

Thanks