Yesterday morning, I woke up to discover our office internet access was down. I contacted our ISP and they resolved the problem within an hour. However, after they resolved the issue, OWA was not accessible externally. We can access it internally with a private IP address, but it is not accessible by like it was before. I have had several people test this for me with different ISPs. Our ISP initially said it's something wrong with our firewall, but now is stating it is something wrong with our Exchange server. I think it's a little odd that OWA stopped working AFTER the internet outage. I checked our firewall and Exchange server and it appears nothing has changed. I have now discovered that you can access OWA by using https instead of http. However, I don't have SSL enabled for OWA. My ultimate issue is that our treos are not working because we can't access by HTTP. Any suggestions or ideas on what could be causing the problem?