Here's our Microsoft Office Tip for.. July 28, 2003
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Sharing Your Presentations with Others
Handing off a copy of your PowerPoint 2000 presentation to somebody else is no problem: You simply need to ensure that they also have PowerPoint 2000 also and--uh-oh. They're still working with an older version. NOW what?

Well, if they have PowerPoint 97, there's not too much to worry about. PowerPoint 2000 and 97 share a common file format, so they can read one another's files without difficulty. A few new-to-PowerPoint 2000 features aren't supported in PowerPoint 97, though:

Animated GIFs won't animate in PowerPoint 97. Custom picture bullets aren't supported, either, so it's a good idea to replace these with standard bullets before handing off your presentation.

If the other party has PowerPoint 95 (also called PowerPoint 7), you'll need to save your presentation in that format before giving them the file. Here's how:

Open the presentation and choose File, Save As. From the Save As Type drop-down list, choose PowerPoint 95 (*.PPT), and then give the file a name and save it. (If the other party has PowerPoint 4, follow the same steps, but choose PowerPoint 4 (*.PPT) from the Save As Type list.)

Finally, be aware that if you have any bitmapped images in your presentation (scans, digital photos, paint images, or screen captures), files saved to PowerPoint 95 and PowerPoint 4 formats may grow very large. Neither of these formats supports image compression, whereas PowerPoint 97 and 2000 both do. When you save to earlier versions, PowerPoint has to decompress any images in your presentation, which accounts for the larger file size.