Visio Viewer is freely available from Microsoft. If your co-workers and customers don't have Visio installed, they can install the viewer, then view and interact with Visio drawings that you send them in a browser or in Outlook. If they have Outlook 2007, then they may already have the viewer installed, because Outlook installs the Visio 2007 viewer by default.
With the Visio Viewer, they can pan and zoom, switch pages, view Shape Data (Custom Properties), turn layers on and off, and view or hide annotations.
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 displayed.
Visio Viewer enables users to discover the advantages of using Visio drawings, charts, and illustrations in a Web-based environment. The Visio 2010 (Beta) Viewer is particularly useful for teams that need to collaborate from different locations.
Viewing Visio drawings is as simple as double-clicking the drawing (files with the .VSD, .VSS, .VST, .VDX, .VSX, or .VTX extension) in Windows File Explorer. Internet Explorer will open, and the Visio 2010 (Beta) Viewer will render the drawing in the browser window. You can then pan and zoom in the drawing window by using toolbar buttons, keyboard shortcuts, or menu items in the right-click menu.
Note: Windows XP or later operating system is required for Ink support. Objects created with the Ink tool in Visio will not display on Windows 2000.
The Visio Viewer will allow users to view Visio drawings and diagrams (created with Visio 5.0, 2000, 2002, 2003 or 2007) inside their Internet Explorer version 5.0 or newer Web browser.