Hello all, I have upgraded ILM 2007 FP1 to ILM 2007 FP1 SP1. I have write a code to provision a mailbox to 2007, which is as below. newCSEntry = ExchangeUtils.CreateMailbox(tragetMA, newCSEntry.DN, samAccountName, this.GetStroageGroupDN(ro_mventry["positionTitle"].Value)); when I am trying to provision mailbox for new user , mailbox get created but user email id not get populated in his AD account. and when I try view the property of the user in Exchange server. I am getting bellow message. Can anyone help me on this...........?