Machine: Windows XP, IE 8, Updated

When opening Outlook, or OWA security alert says Entrust OWA certificate has expired.

Have tried everything known to man:

1) Installed all ROOT CAs
2) Removed all certs with OWA
3) Updated Windows XP
4) Updated IE to 8
5) Reset/Restored IE
6) Cleared all temp internet files/cookies
7) Rebuilt mail profile
8) pinged, arped, gupdated, netiped, and flushed

The message keeps popping up and there is already a GoDaddy cert in place of it. No other machine has this issue. Any known solutions?