You did not receive an e-mail in PowerPoint presentation but you can not open it because the computer you use does not have the PowerPoint installed?
Powerpoint file viewer comes to solve your problem. Microsoft Powerpoint Viewer is compatible with all Windows versions and it is not more than 23 inches on your computer.
From now on and thanks to Microsoft Powerpoint Viewer, you will not be able to buy the complete version of Microsoft Office to open PPT files. Although it's a free version, it's useful and includes all the options you can find using Microsoft PowerPoint.
Fast, easy and free?