Cause: PowerPoint 2011 does not include Meeting Minder.
Solution: Copy the Meeting Minder notes using PowerPoint 2004 or earlier to the notes pane in PowerPoint 2011.
In PowerPoint 2011, open the presentation that contained the Meeting Minder notes.
In your earlier version of PowerPoint (the version that the Meeting Minder notes were created with), open the same presentation.
Copy the Meeting Minder notes in the earlier version of the presentation, and then paste them in the notes pane of the PowerPoint 2011 presentation.
Close the earlier version of the presentation, and then save the PowerPoint 2011 presentation.