If others will be opening your slideshow using an older version of Keynote, you can export the slideshow to iWork ’08 format. New features included in Keynote ’09, such as new transitions or build effects, might not be retained when the presentation is exported to the previous version.
Open the slideshow you want to export.
Choose File > Save As.
Type a name for the file and select a location.
Select ”Save a copy as” and choose iWork ’08.
If you don’t see these options, click the disclosure triangle to the right of the Save As field.
If you don’t want to include audio and movie files in the export, click Advanced Options, and then deselect “Copy audio and movies into document” (this option is on by default).
Click Save.