Impress is the PowerPoint equivalent in OpenOffice. Generally, you can load and present PowerPoint presentations with little difficulty in Impress.

Fonts are sometimes cause of concern, with some MSWindows fonts not available under other operating systems. This manifests itself most often with bullets which use the wingding font in PowerPoint. To have these automatically converted to dingbats in OpenOffice go to Tools-Options-Fonts and specify the Font as Wingdings and Replace With Dingbats and click the tick. Newer versions of OpenOffice have fixed most of these such incompatibilities.