We have SBS2003 with Exchange Server 2003. Everyone uses laptops with Outlook configured to connect over the Internet.
One client has an Vista Business laptop with Outlook 2007. He has has just gone out to China for a few weeks. Before he left the UK everything was ok. Since he arrived in China, he cannot send or retrieve email. The status is continually 'Trying to connect'. Everything else is working ok for him. He can browse websites, he can TS into our Terminal Server and he can get his webmail on OWA. We have a couple of people permanently out in China. Their laptops are connecting to the Exchange Server over the internet just fine.
So what might the problem be with this particular client who has just arrived in China.