PDF is always the universal format for sending the files. With lot of versions of MS Office and other Office suites around .. it is better to circulate the Deck as a PDF
The following snippet converts the Presentation to a PDF and saves in the same folder of the PPT
ActivePresentation.ExportAsFixedFormat ActivePresentation.Path & "\" & ActivePresentation.Name & ".pdf", ppFixedFormatTypePDF, ppFixedFormatIntentPrint