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Visio Answers forum
Visio MSDN forum
MSDN for Visio Developers
TechNet for Visio Services in SharePoint
Chris Hopkins' Visilog
The Visio team is pleased to announce that the online version of the Visio 2010 SDK documentation is now available here. This documentation, which also shipped with the Visio SDK download, is intended to help developers working with the Visio APIs, ShapeSheet and XML. It contains the following Visio developer references.
For Visio Services developers, documentation is available online as well as offline via the Microsoft SharePoint 2010 SDK. This documentation is divided into Visio Services in SharePoint Serveroverview articles and Visio Services Class Library technical information, and covers the following topics.
As always, we enjoy hearing your feedback about Visio, the Visio SDK and our documentation. Please feel free to post any questions or suggestions to our blog.