Remove Exchange 2007 from Organization

Hello All,

After successfully migrated Exchange 2007 to Exchange 2013, I try to uninstalled and removed off the organization but I got the follow error when I uninstalled Exchange 2007. 

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).

Please help.

Thanks

Jimmy