You can try my free add-in - Update links -
http://skp.mvps.org/updtlinks.htm. Paste link the desired cells in to the
PowerPoint slide. When you run the slide show with the add-in loaded the
contents will refresh every time it loops. If you intend to edit the Excel
spreadsheet while the slide show is running, ensure that the worksheet is
set to work in shared mode and not exclusive.


--
Regards,
Shyam Pillai
Handout Wizard: http://skp.mvps.org/how. PowerPoint 2010 (32-bit/64-bit)
versions supported.

"Brent" Brent @discussions.microsoft.com wrote in message
...
I have a presentation designed for an office lobby and cannot figure out
how
to have an excel formula embedded into the slideshow change without
shutting
down the presentation and restarting it. The formula displays the number
of
days without a safety mishap. I thought by making the powerpoint show a
playlist it might update...it didn't work. Any ideas would be
appreciated?