i want to add a external account to a mailbox, in exchnage 2003 you can open the account end simply add a account and place external account to it. the you have a linked mailbox.
but this is not possibly on a exchange 2007 sp3 machine. I understand that now you have to do it with powershell.
can someone give met the correct commanline to do this. the external account must have fulll control on the mailbox.