Isn this just Apaches mod_rewrite for Microsoft IIS?
No. Mod_rewrite is a URL rewriting mechanism for the Apache Web server that cleans query strings and executes arbitrary rewrites. This mod can be extremely complex to configure and maintain. There are also similar generalized URL rewriting tools for IIS based on mod_rewrite, but these tools require you to write and maintain complex rule sets. On the other side, PageXchanger is designed for IIS and focuses on automating clean URLs and content negotiation. PageXchanger requires little configuration to achieve substantial benefits out of the box. Bottom line, if security, migration, and content negotiation are your aims on an IIS Web server, PageXchanger is the only solution on the market.