Exchange server 2003 is installed on windows server 2003 ; active directory is installed on windows server 2003 The Users can logon internally with outlook web access without any problem But the same user cannot access his mailbox form externally. The error is "The folder can't be displayed. You don't have permission to perform this action" If anyone have any clue about this error you will feel free to tell me If you have any further question, you will ask meMuhammad Nauman

The perms on the OWA virdirs prob got changed. Open IIS and and go to the properties, directory security tab and verify you have like below. Default Web site Enable Anonymous access Integrated Windows Authentication Exadmin Integrated Windows Authentication Require SSL Require 128 bit Exchange Basic Authentication Default Domain \ Exchange-oma Integrated Windows Authentication Basic Authentication ExchWeb Enable Anonymous access Require SSL Require 128 bit Microsoft-Server-ActiveSync Scripts and Executables Exchange Application Pool Basic Authentication Default Domain DomainName OMA Scripts Only ExchangeMobileBrowseApplicationPool Basic Authentication Default Domain DomainName Public Basic Authentication Default Domain \ Require SSL Require 128 bit James Chong MCITP | EA | EMA; MCSE | M+, S+ Security+, Project+, ITIL msexchangetips.blogspot.com

Another option is to reset the virtual directories using this Technet article: http://support.microsoft.com/kb/883380 Simon. Simon Butler, Exchange MVP Blog | Exchange Resources | In the UK? Hire Me.