Visio files stored in OneDrive or SharePoint can be viewed through Visio for the web, or OneDrive for the web.
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After selecting the Visio email attachment you wish to view, select Share > Save to Account.
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Choose the OneDrive account you'd like to save the file to.
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Using your browser, navigate to visio.office.com and sign in with the same account as above.
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Choose the file you saved to view it in Visio for the web.