There you can open it and edit it anywhere with a web browser or a copy of Office 2013. Additionally, there are free PowerPoint apps on Android, Windows Phone, iPad and iPhone.

When you convert Keynote files to PowerPoint, you can allow collaborators without Keynote to open presentations on non-Apple computers.

Having two presentations open in separate windows also lets you transfer details – and even entire slides – from one to the other with both open at the same time.