Article ID: 982953 - View products that this article applies to.
Consider the following scenario:
In this scenario, the user cannot see the notes that you posted to the Note Board.
This issue occurs because of a known problem in the navigation security trimming in SharePoint Server 2010.
To work around this issue, add the absolute URL of the Web Part page to the URL property field of the Note Board Web Part.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For more information about the Note Board, visit the following Microsoft TechNet website:
Social tagging overview (SharePoint Server 2010)