Can open a calendar in OWA, but files give 403 forbidden error

Hi, I am a Firefighter in Ohio.  We are trying to get our daily schedule available to members on the OWA server so they can check the schedule from home.  The files can be opened in outlook on in house computers.  The public folders are visible and I can open the calendar and add/remove appointments.  I created a separate folder called 2008 schedule.  I can open that folder and see the excel file.  When I click to open it, I get a new window and a This website requires you to log in. screen.  In the more detail screen, it says, This error (HTTP 403 Forbidden) means that Internet Explorer was able to connect to the website, but it does not have permission to view the webpage.  

I have found information about a registry change for freedocs, but I am not sure if this needs to be done on our server and then on everyone's home computer as that would not be an easy thing to accomplish.  Also, the file is not drag and drop, it is sent to the 2008 schdule folder from excel with the send to: exchange server command.  

We have MS server 2003 and Office 2003 running.

Thank you for your Help
Rod Standiford
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The freedocs reg tweak needs to be done the front end and back end exchange servers, not the clients.,289483,sid43_gci1164259,00.html?track=lg_outlook_web_access


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