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This is all great unless you've been running PowerPoint 2008 for Mac. The original version of PowerPoint 2008 didn't have good support for the venerable animated GIF format. But Microsoft has come to the rescue with an update to PowerPoint 2008. The update is called the Office 2008 Service Pack 2 and it was released in July of 2009.
This free update fixes various issues and adds complete support for animated .GIFs. If you've been updating your software all along, you likely are already running this patch. But if you are experiencing difficulties with our animated gif animations in Mac PowerPoint 2008, it's likely that you need to update your software.
Here is a link to the for Mac. You'll want to browse for downloads at the bottom of the page to find the appropriate download.