http://blogs.technet.com/tarpara/archive/2008/10/02/tip-of-the-day-powerpoint-2007-increase-the-number-of-undos-you-can-do.aspxAdd More Levels of Undo You can go back farther in Microsoft Office PowerPoint to undo actions. 1. With PowerPoint open, click the Office button, and then click PowerPoint Options . 2. On the Advanced tab, change the Maximum number of undos from the defaulten-USCommunityServer 2.1 SP1 (Build: 61025.2)