The Bing Webmaster Tools API might have a week of data loss, a data gap, if you will. There was some sort of issue where the API was not returning data after March 3rd and then after Glenn Gabe reported it to Microsoft's Fabrice Canel, Microsoft fixed the issue but there is two weeks or so of data loss between March 3rd and March 17th...
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Bing Webmaster Tools API Missing A Week Of Data
seroundtable.com