| Feature | IIS 5 Built-In Compression | 
for IIS 4/5/6 | IIS 6.0 Built-In Compression | 
and IIS 6.0 Built-In Compression |
|---|
| IIS 4.0 compression | | Y | | |
| IIS 5.0 compression | * | Y | | |
| IIS 5.1 compression | | * | | |
| IIS 6.0 compression | | Y | Y | Y |
| ISAPI-based compression | * | Y | | |
| Core Web server-based compression | | | Y | Y |
| Full configuration control | | Y | | Y |
| Import/export settings from one Web server to another | | Y | | |
| Migrate settings from one Web site (virtual server) to another | | Y | | |
| Compression control by MIME type | | Y | | |
| Static compression | * | Y | Y | Y |
| Dynamic compression (ASP, ASP.NET, PHP, ColdFusion, etc.) | * | Y | Y | Y |
| Compatible with Akamai's Content Distribution Network (CDN) | | Y | | |
| Compatible with Java platforms such as JSP, BEA WebLogic, IBM WebSphere, Tomcat or any other application server or program that modifies URLs with a DLL or ISAPI filter | | Y | | |
| Compatible with any ISAPI filters like third party URL rewriters | | Y | | |
| Streaming and chunked compression | | Y | Y | Y |
| Browser compatibility checking | | Y | | Y |
| Browser compatibility with clients running Symantec's Norton Internet Security firewall | | Y | | |
| Reporting on compression & bandwidth savings | | Y | | |
| ISAPI/compression timing | * | Y | | |
| Static compression cache | * | Y | Y | Y |
| Dynamic compression cache (with unique query strings/URLs or cookie values) | | Y | | |
| Optional HTML and CSS Code Optimization | | Y | | |
| COM interface | | Y | | |
| Debug mode for troubleshooting with diagnostics report | | Y | | |
| Default compression settings for new sites (primarily for hosting providers) | | Y | | |
| Command line interface | | | | Y |
| CPU Roll-off | | | | Y |
| Deployment wizard | | | | Y |
