On IIS 6.0, does httpZip work in IIS 5.0 Isolation Mode (or backwards compatibility mode)?
No, not yet. We have left that work to ZipEnable and IIS 6.0 native compression for the time being. If you were to clear that “IIS 5 Isolation Mode” checkbox in IIS 6.0, a new folder (“Application Pools”) would appear in the ISM at the same level as the Web Sites and Web Service Extensions folders. In native mode, IIS 6.0 sites always run inside an Application Pool, and each App Pool is serviced by one (or more) worker processes (instances of w3wp.exe). This is versus having everything running inside inetinfo.exe and/or dllhost.exe. These worker processes provide the application with true process isolation (a crash in one won’t destabilize the others), resource quotas, health monitoring, recycling & failover protection, and so on. Unfortunately, all that added sophistication required a total rewrite of the IIS internals for IIS 6.0. This broke backwards compatibility for certain old-style COM and ISAPI applications. Even more unfortunately, IIS 5 Isolation mode is not really just the o
