PowerPoint 2007 won't update links to files on network drives
Problem
You link data from Excel or other files on a network drive to your PowerPoint 2007 presentation. The links work as expected but when you save the presentation and reopen it the links stop working. When you try to update the link, you see this error message:
The linked file was unavailable and can't be updated
Solution
As a workaround, you can move the linked files to your local hard drive and re-link to them there.