Hello 1) we move exchange 2003 conference room mailboxes to exchange 2010 2) we convert them to room mailbox 3) After converting, configure automatic processing of exchange 2010 4) How can we convert them back to exchange 2003 as a conference room from Exchange 2010 . Will the permissions be retained ? Any suggestions will help

Permission should be retained, you need to move the mailbox from 2010 EMC to the 2003 server.Sukh

Hi set-mailbox -Identity user type user. move mailbox from 2010 to exchange 2003. Terence Yu TechNet Community Support

Hi set-mailbox -Identity user type user. Terence Yu TechNet Community Support That will not work. To convert a roommailbox to a usermailbox the correct syntax is: Set-Mailbox USER -Type Regular ...but this doesn't have to be done before moving a mailbox back to Exchange 2003.Martina Miskovic

Hi My syntax is not correct. I will test "this doesn't have to be done before moving a mailbox back to Exchange 2003". Thanks for your advice.Terence Yu TechNet Community Support