Setting Up Default Documents (IIS 6.0)
You can establish a default document for client requests to a Web site that does not specify a document name. Default documents can be a directory's home page or an index page. Before enabling the default document in IIS Manager, you must create the default document and place it in either the root directory or a virtual directory on the appropriate Web site.
You cannot use commas in a default document name (for example, my,file.html). Commas are used only to delimit multiple default documents in the metabase. If you include a comma in the name of a default document, IIS uses the comma to notate two default documents.
You must be a member of the Administrators group on the local computer to perform the following procedure or procedures. As a security best practice, log on to your computer by using an account that is not in the Administrators group, and then use the runas command to run IIS Manager as an administrator. At a command prompt, type runas /User:Administrative_AccountName "mmc %systemroot%\system32\inetsrv\iis.msc".
To set up or change the default document