url rewrite

http://www.microsoft.com/taiwan/technet/iis/expand/URLRewrite.aspx

http://www.iis.net/learn/extensions/url-rewrite-module

http://www.iis.net/learn/extensions/url-rewrite-module/creating-rewrite-rules-for-the-url-rewrite-module

http://www.iis.net/learn/extensions/url-rewrite-module/using-rewrite-maps-in-url-rewrite-module

http://www.iis.net/downloads/microsoft/url-rewrite