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msnbot was a web crawler robot deployed by Microsoft to collect documents from the web to build a searchable index for MSN Search (now Microsoft Bing). It went into beta in 2004 and had a full public release by 2005. It was retired in October 2010 and replaced by Bingbot.

As of September 2015, msnbot was still active, given that the Microsoft and the Bing webmaster help and how-to documentation indicated that it was still active (but it would be retired soon).