Can't uninstall Exchange 2010 (can't delete public folders)

Mailbox Role Prerequisites
Failed

Error:
Uninstall cannot continue. Database 'Public Folder Database 1166479595': The public folder database "Public Folder Database 1166479595" contains folder replicas. Before deleting the public folder database, remove the folders or move the replicas to another public folder database. For detailed instructions about how to remove a public folder database, see http://go.microsoft.com/fwlink/?linkid=81409&clcid=0x409.
Recommended Action: http://go.microsoft.com/fwlink/?linkid=30939&l=en&v=ExBPA.4&id=b6e3b32a-8848-46cb-9567-72288ac15f60

Elapsed Time: 00:00:38


I open Public Folder Management Console and when I select "Default Public Folders" I get message:
Multiple MAPI folder trees were found

then following this article http://technet.microsoft.com/en-us/library/dd535370.aspx
I start the ADSI Edit tool and navigate to

• Configuration [<domainController>.contoso.com]
• CN=Configuration,DC=contoso,DC=com
• CN=Services
• CN=Microsoft Exchange
• CN=<OrganizationName>
• CN=Administrative Groups
• CN=<AdministrativeGroupName>
• CN=Folder Hierarchies

but the only Public Folders tree I see there is CN=Public Folders so at this point I don't know what to do next?