PowerPoint versions puzzle: PowerPoint 2003 to PowerPoint 2007, PowerPoint 2007 to PowerPoint 2003?

Question1: I have 2007 Microsoft but get email PowerPoint 2003 how do I save it as 2007 so I can insert other PowerPoint?
Question2: I have prepared a slide show that was done in Microsoft PowerPoint 07 version can I view it in 03 version?
Have you ever been puzzled with these problems?
It's really inconvenience for us to play PowerPoint on different computers, because we have to worry about versions of PowerPoint installed on these computers.
1, Animation affects you have applied for the presentation in Microsoft PowerPoint '07 may not be available in '03 version
2, the commands and buttons in '07 version are so different from '03 version, you may not operate '07 version as fluently as fluently '03 version. What if you are fresh to '07 version but you have to do your presentation with PowerPoint 2007? Embarrassing!
3, The PowerPoint presentation you made on '03 version may not compatible on '07 version.

Here I provide you a solution to terminate your puzzle permanently.
Convert PowerPoint to DVD, play PowerPoint on DVD machine and TV set.
We need this tool: Moyea PPT to DVD Burner.
Follow these three steps:
1, Install and run the program, import PowerPoint presentation to it, any version of PowerPoint you'd used to make the PowerPoint presentation will be ok.
2, Customize settings
3, Start to convert and burn PowerPoint to DVD.
Now you can do you presentation by playing the converted DVD video on DVD player and TV set/projector. Is that interesting and brings us great convenience?

Tips:
1, the effect of burned DVD video is the same as original PowerPoint.
2, click to see other advantages of converting PowerPoint to DVD