IIS team has released the URL Rewrite Module for IIS 7.0 Release To Web (RTW). This is a final, production-ready release that is officially supported by Microsoft. The URL Rewrite module supports features including: rules-based URL rewriting engine, regular expression pattern matching, wildcard pattern matching, global and distributed rewrite rules; access to server variables and http headers, etc.
If you already have Go Live release of URL Rewrite module installed then the installation package will upgrade it to RTW release. All rewrite rules in applicationHost.config and web.config files will be preserved. Note that system reboot may be necessary when upgrading from Go Live to RTW release.
The installer for URL Rewrite module includes an update for ASP.NET runtime. The update has fixes for bugs specific to URL rewriting. The update is applied only if the machine where URL Rewrite module is being installed has .NET Framework version 3.5 SP1 or higher. If required version of .NET Framework is installed after URL Rewrite module has been installed, then the ASP.NET update can be applied by re-running URL Rewrite module installer in repair mode.