Error when creating a public folder mailbox in Exchange Server: An existing Public Folder deployment has been detected
Original KB number: 3004062
When you try to create a public folder mailbox in Microsoft Exchange Server, you receive the following error message:
An existing Public Folder deployment has been detected. To migrate existing Public Folder data, create new Public
Folder mailbox using -HoldForMigration switch.
This problem occurs when the Exchange organization coexists with an earlier version of Exchange Server, and one or more public folder databases from the earlier version of Exchange still exist.
To resolve this issue, use one of the following methods.
Method 1: Create the mailbox by using the -HoldForMigration switch
This option lets an administrator create a public folder mailbox in order to begin a migration from the existing public folders:
Open the Exchange Management Shell.
Run the following cmdlet to create the public folder mailbox:
New-Mailbox "Public Folder Mailbox" -PublicFolder -HoldForMigration