Use the URL http://mycustomdomain.configio.com/sitemap.aspx to use the Site Map in Webmaster Tools!
Sitemaps help Google discover pages on your site our crawlers might otherwise miss. The Sitemap Details page in Webmaster Tools displays detailed information about each of the Sitemaps (including Sitemap index files) you've submitted to Google. Indexing stats are updated periodically, usually every few days, and the indexed number is a close approximation of the URLs in Google's index.
Sitemaps
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