Cant move mailbox back to exchange 2007 from 2013 ..

I recently configured coexistence between exchange 2007 and 2013.

I have moved some users to 2013 and they are fine.

I recently moved "BESADMIN" account to exchange 2013 while trying to integrate exchange 2013 with BES. The integration is suspended for now and I am trying to move the mailbox back to 2007. From ECP it completes successfully but running get-mailbox cmdlt shows that the mailbox is still in 2013.

I have also tried using management shell but it fails at 95%

I will appreciate all the help I can get here ..

~Richard

..forever is just a minute away*