Are you looking to migrate away from Visual Studio 2010, or are you trying to troubleshoot a specific feature within it?

Many CAD/CAM vendors and ERP systems only certified their plugins for VS 2010 Ultimate. If a manufacturer upgrades their IDE, their $50,000 ERP plugin stops working.

Review: Visual Studio 2010 Ultimate Edition | Stories - DotNetKicks

Windows XP (SP3), Windows Vista, Windows 7, Windows Server 2003/2008 Processor: 1.6 GHz or faster processor RAM: 1 GB RAM (2 GB recommended for virtual environments) Hard Drive Space: Up to 10 GB of available space

The Ultimate edition provided specialized testing tools intended to improve software quality, bridging the gap between development and quality assurance.