Internet Information Services (IIS)
[Applies to: Microsoft Dynamics CRM 4.0]
You must install and run either Internet Information Services (IIS) 6.0 or IIS 7.0 in IIS Compatibility Mode before you install Microsoft Dynamics CRM Server.
When you install the Microsoft Dynamics CRM Server Web application on a computer that is running IIS, Microsoft Dynamics CRM Server Setup will enable HTTP compression by default. If you use a different method to compress HTTP communications, you may want to disable this feature. To do this, start IIS Manager, right-click the Web Sites folder, click Properties, click the Service tab, and then clear the Compress application files and Compress static files check boxes.