
Almost a year after the start of development, the Go-Live release of the ISAPI 
FastCGI extension for the 
IIS web server versions 5.1 and 6 was released.
Compared to traditional CGI, in which each new HTTP request initiates the launch of a new copy of a CGI application, when using FastCGI, the software process is 
not unloaded after the page is issued and reused during the processing of the following pages, thereby ensuring a 
manifold increase in server performance as a whole.
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The extension was developed by Microsoft in 
cooperation with Zend, which is the core developer of the popular 
PHP web programming 
language , with the goal of making it possible to 
efficiently use the latter on the Windows platform in conjunction with the IIS web server. In the upcoming IIS 7, FastCGI support will be built in initially.
On the official IIS website, in parallel, a new 
section opens, entirely devoted to PHP.
Zend, as part of its part of the above-mentioned agreement with Microsoft, has introduced a number of major improvements to PHP since version 5.2.0, concerning the optimization of PHP performance under Windows.
It should be noted that the 
native , developed by Microsoft, support for FastCGI in IIS is implemented for the first time - earlier FastCGI technology was available only through the use of third-party developments.
PS Go-Live-release, strictly speaking, is not final - it means that Microsoft provides its support in full and that it can be used for production-purposes, however later clarifying releases are possible.
Update: On November 10, 2007, the 
final FastCGI version for IIS 6.0 was released .