PowerPoint 2019, and the (newer) version of PowerPoint included with Office 365, are able to read SVG figures as vector graphics. As Ipe is able to create SVG files, this creates a way to get Ipe figures in PowerPoint, in such a way that they can still be edited in PowerPoint (as PowerPoint shapes).
You can export Ipe files to SVG by using File > Export as SVG.
Alternatively, there is a terminal command
iperender to do it. The syntax is
$ iperender -svg -page <page_number> -view <view_number> <input>.ipe <output>.svg
On Windows, you'll need to replace
iperender by the full path name of
iperender.exe. As this is cumbersome, it is easier to make a batch file like this:
"D:/Downloads/ipe-7.2.9/bin/iperender.exe" -svg -page 1 -view 1 %1 %~d1%~p1%~n1.svg
Replace the path to
iperender.exe, and save the batch file as
ipetosvg.bat. Now you can drag-and-drop an
.ipe file onto the icon of this batch file, and the figure will be converted to an
.svg file in the same directory.
An SVG file can simply be dragged onto PowerPoint to insert it. At that point, it is a non-editable object.
If you want to be able to edit the figure with PowerPoint's drawing tools, you need to convert it to PowerPoint shapes. Note that this process is not perfect; some features will be lost (for example text labels, gradients, and clipping paths). The conversion can be done by right-clicking the figure and selecting Convert to Shape. This will bring up a dialog warning that this may lose formatting; just click Yes. The figure is now ready to be edited in PowerPoint (you may need to ungroup it first).