In Lesson 4, you imported a Microsoft PowerPoint presentation and enhanced it. This is usually the desired workflow when using PowerPoint files. However, you can build a presentation in Keynote and then save it as a PowerPoint file.
This can help you if you are creating a presentation that you need to send to a Windows user for additional editing.
Note that PowerPoint handles graphics differently than Keynote, so there may be slight variations in the exported slideshow (especially on a Windows computer). PowerPoint also does not support some Keynote featuresfor example: