Microsoft Exchange database delete error

In an Exchange 2007 server, I tried to delete an Exchange PF database, but I got the following error:
Microsoft Exchange Error
The public folder database 'SG02PF1' cannot be deleted.
SG02PF1
Error:
Object is read only because it was created by a future version of Exchange:
0.10 (14.0.100.0). Current supported version is 0.1 (8.0.535.0).
Then, I logon to an Exchange 2010 server, and I run the following powershell command:
"Remove-PublicFolderDatabase -Identity "WINCMSSG02SG02PF1"
This also returned a similar error. Any help or direction would be really appreciated.
