Exchange 2010 Databases - default public folder points to Exchange 2007 public folder database

Before deleting the public folder database, assign a new public folder database to the mailbox database(s).

I'm trying to get rid of a public folder database that exists in Exchange 2007. Primarily because nobody uses it -- I've had it dismounted for over a month.
Secondly, because all the databases, including those databases in Exchange 2010, are pointing to it as their Client Settings - Default public folder database settings (under Organization > Mailbox - Database Management - [database name]  - properties.

In ADSI Edit, I was able to clear the value of this target public folder database for the Exchange 2010 databases, however, the public folder still remains as in the Client Settings tab for the Exchange 2010 databases, and it also remains attached to all the other Exchange 2007 databases.

I've no idea how to remove it.

Every time I try, I get the error:
Before deleting the public folder database, assign a new public folder database to the mailbox database(s).
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mohammad bazzariMicrosoft Infrastructure ExpertCommented:

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Amit KumarCommented:
Please try this article

You will also need to clear msExchHomePublicMDB  attribute from ADSIedit

 CN=Services -> CN=Microsoft Exchange -> CN=(your organization name) -> CN=Administrative Groups -> CN=Exchange Administrative Group (FYDIBOHF23SPDLT) -> CN=Databases.

Right-click the mailbox database you want to remove the default public folder database from and choose Properties.

Scroll down until you find the msExchHomePublicMDB attribute. Highlight it and then click Edit.
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