Hi there,I have had a request through asking whether we would be able to allow a Generic Departmental Calendar (Internal) to be visible via an external webpage )link on webpage.We use a standard Microsoft Firewall to publish resources and have Exchange 2007 at the backend. They do not want any authentication prompts for the external users accessing this Calendar. My initial reaction is that this is theoretically possible (at a stretch) but definitely not practical or advisable.My reasoning is that the the authentication issue will be very difficult to overcome. I suspect there would be a need for a dedicated certificate for whatever URL we provide for access to this internal Calendar, we would need to publish it via the firewall, and I don't know how we would get around the authentication issue.Does anyone have a slightly more technical way of explaining this?

Hi, I guess its bit hard to implement practically. You may try to provide the required permission and publish to ISA. You may use the following related articles and tools if that suits you. Ref to: Publishing Exchange 2007 OWA with ISA Server 2006 http://www.msexchange.org/tutorials/Publishing-Exchange-2007-OWA-ISA-Server-2006.html Publishing Exchange Server 2007 with ISA Server 2006 http://technet.microsoft.com/en-us/library/bb794751.aspx Calendar Tools http://www.msexchange.org/software/Calendar-Tools/ All the Best :) Sathish Kumar Elango | MCSE 2003 & MCSA Messaging | http://msexchangehelp.wordpress.com

Hi,Hople the below link can help you:Introduction to publishing Internet Calendarshttp://office.microsoft.com/en-us/outlook/HA101743551033.aspxThanksAllen