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Mac users have access to several applications with similar functions to corresponding Microsoft programs. These include Pages (a word processor similar to Microsoft Word), Numbers (a spreadsheet application similar to Microsoft Excel), and Keynote (a presentation application similar to PowerPoint).
When sharing documents with non-Apple users and in general, converting your files to the more universal Microsoft applications helps to ensure that the recipient can open the file you send.
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Converting your Keynote files to the corresponding Microsoft PowerPoint format takes just a few clicks. It saves Windows users the trouble of using a third-party app to open their Apple file.
After you've converted the Keynote file to a PowerPoint file, you can check that your presentation saved correctly when you attach it to an email. The file type at the end of your upload name should read ".pptx." It will read ".key" if it's still a Keynote file.
Here's how to convert a Keynote presentation to PowerPoint.