When using rewrite maps in IIS URL Rewrite it is very common to have a very large number of entries in a rewrite map. In order to avoid cluttering the configuration file - web.config - with this configuration data the rewrite maps can be defined in a
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Read the complete post at http://blogs.iis.net/ruslany/archive/2010/05/19/storing-url-rewrite-mappings-in-a-separate-file.aspx