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From Microsoft: Microsoft Visio Professional 2013 is used to create and share professional, versatile diagrams that simplify complex information. It includes all of the functionality of Visio Standard 2013 as well as updated shapes, templates, and styles. It enhanced support for team collaboration, including the ability for several people to work on a single diagram at the same time, and the ability to link diagrams to data. Visio Professional 2013 also adds additional stencils for business and engineering diagrams, process diagrams (including Business Process Model and Notation, maps and floor plans, network diagrams, and software and database diagrams. With Visio, you can quickly capture a flowchart that you brainstormed on a whiteboard, map an IT network, build an organizational chart, document a business process, or draw a floor plan.
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Professional: This edition supports the reverse engineering features for the Database Model Diagram template (that is, using an existing database to create a model in Visio) but does not support forward engineering (that is, using a Visio database model to generate SQL code).