I have a Windows 2003 Enterprise Edition server (with SP1 from CD) running exchange 2003 (with SP1). I can connect to the exchange server using OWA, but whenever I use a mail client Office 2003 running on Windows XP, I get the following error when I click check name "The Name could not be resolved. The action could not be completed.". I have checked all the settings and searched this site, but I cannot find anything that has solved the problem as yet. Has anybody got any suggestions?