Michelle Dixon of Microsoft SBS Support writes about a great Exchange 2003 resource:
OWA Admin Tool
In the past, if you needed to customize features in OWA, such as hiding Calendar or Journal, you had to edit the registry and add some not-very-intuitive values. Now we have a GUI-based tool, the OWA Administration Tool. The same complicated changes you previously had to make via regedit, can now be done with a check box.
The tool is easy to install and requires no configuration. You can download the OWA Admin tool from the following link: http://www.microsoft.com/downloads/details.aspx?FamilyID=4bbe7065-a04e-43ca-8220-859212411e10&displaylang=en
To access the tool once it is installed, go to Start, All Programs, Microsoft Exchange, Outlook Web Access Administration Tool. This will bring up a SharePoint type web page. You can also access the tool by going to https://servername/OWAAdmin
Here is a link to an article that has a map to the links from the main OWA Admin page. http://www.msexchange.org/pages/article_p.asp?id=665
In my opinion, this tool will be a wonderful time and frustration saver for anyone looking to customize OWA!
–– Michelle Dixon