Microsoft Office Visio 2010 Professional is a System Utilities software developed by Microsoft Corporation. After our trial and test, the software is proved to be official, secure and free. Here is the official description for Microsoft Office Visio 2010 Professional:

BS Editor: Visio Professional 2010 provides advanced diagramming tools to help you simplify complexity with intuitive and professional-looking Diagrams, dynamic and data-driven visuals, and new ways to share via a browser in real time.
Easily Illustrate complex ideas visually with professional-looking templates and modern, pre-drawn shapes
-Create dynamic, data-driven diagrams that are connected to real-time business data and refresh automatically
-Share interactive, refreshable, data-linked diagrams with others via their web browsers
-Maximize consistency and accuracy across your organization with Diagram Validation that can find common errors or check for business logic
-Apply intelligent and advanced diagrams in business-process Analysis/BPM, compliance/quality, and rule-based diagramsImport, save, and work with CAD files
-Improve consistency and accuracy across your organization with advanced diagramming and new process-management tools
-Drill down with pivot diagrams to provide graphical business intelligence analysis to Microsoft Office Excel, Microsoft Office Access, Microsoft SQL Server, or any OLEDB/ODBC data sourceSee the entire picture by showing meaningful data and information graphically in a single, up-to-date diagram
-Dramatically improved user experience and intelligent drawing tools and templates make every step in creating diagrams easier
-Add and align shapes easily and accurately with features such as the Quick Shapes Mini Toolbar, Page Auto Size, and Auto Align & SpaceMake your business-process diagrams easy to understand and professional-looking by using Visio 2010 Subprocesses and Containers to organize related shapes visually and logically