Microsoft is working to resolve a known issue that prevents some users from opening Excel email attachments in the new Outlook client.
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The Simplest Ways to Open, Edit, and Convert XLSX Files
You don't necessarily need Microsoft Excel to work with an .xlsx file Reviewed by Ryan Perian This article explains what XLSX ...
Are hyperlinks not opening or working in your Excel workbooks? In Excel, hyperlinks are used to open specific documents, files, folders, or web addresses saved on a network server, intranet, or web.
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