Unable to add replica of legacy Exchange public folders to Exchange 2007 public folder store

Error :
==========
"There are no Public folder stores which do not have a replica of this folder"

If we try to run the following Management shell command

Get-PublicFolder -Identity \NON_IPM_SUBTREE -Recurse | Format-List Name

We received following error

"There are multiple MAPI public tree found"

ENVIRONMENT:
=============

2 Exchange Servers
Exchange 2000 server
Exchange 2007 (CAS,HUB,MBX)


RESOLUTION:
============

We noticed that they have Two MAPI public folder tree available in the Org
One for E2K Admin Group and One for E2K7 Admin group
Checked the msExchPFTreeType of the Hierarchy Tree and both set to the value 1
We set the Exchange 2007 MAPI tree we set the value of msExchPFTreeType to Not set.
That made the public folder tree ad NON MAPI tree
Then deleted the public folder from Exchange 2007, then we created new public
folder (Public folder database was with empty data)
We made sure that it is associated with the correct Tree
After that the Exchange 2007 public folder showed in the add replica list, Then we
added the replicas successfully