This update for Adobe Acrobat 5.0 provides additional compatibility and fixes known issues, including support for Microsoft Windows XP and better integration with Microsoft Office XP. If you own Acrobat version 5.0, you should download and install this update. Although the Acrobat start-up screen and package list version 5.0, you may already own version 5.0.5. To see which version you have, choose Help > About Adobe Acrobat. The version number appears in the upper left corner, next to the Adobe logo.