Today, we’re announcing a closer and much deeper relationship with ESRI by integrating Bing Maps Virtual Earth tiles into their ArcGIS Desktop product. 
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Isaac Kunen from the SQL Server team published an outstanding MSDN article entitled, “Introduction to Spatial Coordinate Systems: Flat Maps for a Round Planet.” This is a great article for those of you who are just getting started in GIS, are curious about GIS but intimidated by math and coordinate systems or just plain geeky and like maps. 
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This blog has been updated by the new bing! Did you know that Microsoft Maps Platform, Bing Maps for Enterprise offers more than just map tiles! Ortho Tile Sets that leverage Satellite, Birdseye & Streetside imagery are also available
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UPDATED 2023: Please see the topic at Bing Maps Tile System - Bing Maps | Microsoft Learn for more details to answer the common question  “What is the resolution or scale at a particular zoom level in Virtual Earth or Bing maps?” 
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