From Microsoft: ‘The Visio Viewer 2003 allows anyone to view Visio drawings and diagrams (created with Visio 5, 2000, 2002, 2003, 2007, 2010) inside Internet Explorer version 5.0 or later.
Visio users can freely distribute Visio drawings and diagrams to team members, partners, customers, or others, even if the recipients do not have Visio installed on their computers. Internet Explorer also allows for printing, although this is limited to the portion of the drawing currently displayed.
The Visio Viewer enables users to discover the advantages of using Visio drawings, charts, and illustrations in a Web-based environment. It is particularly useful for teams that need to collaborate from different locations.’
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