Hi In Exchange 2010 I have a few mailboxes which has been migrated in a cross forest migration. some mailboxes is displayed as Linked, and they have a LinkedMasterAccount set, however the useraccount in the same forest as the mailbox is enabled, and it seems to that users logon adn use the mailbox in the new domain without any problem. Question which consequence is there for this? - can the LinkedMasterAccount in the old forest still access the mailbox? - will there be any issues in the new forest? - Should I clean this up somehow? - And how? In advance thanks for your help. /Ruben

You can try using following script to disconnect the linked mailbox and convert it to user mailbox using script mentioned in this article. http://messagingserversupport.com/2011/10/25/disconnectreconnect/ To Reconnect User mailbox. #To disconnect and reconnect the user mailbox. It will copy the proxyaddresses, Mailbox permissions $i = $null $i =@() $i +=Hasnain.Shaikh foreach ($a in $i) { ############################################### $a | out-host $gm = get-mailbox $a | select * $gms = get-mailboxstatistics $a | select * $gmp = get-mailboxpermission $a | select * $gm $gms $gmp $gadp disable-mailbox $gm.alias -confirm:$false clean-mailboxdatabase $gm.database start-sleep 90 connect-mailbox $gm.exchangeguid -database $gm.database -Alias $gm.mailnickname -user $gm.samaccountname -DomainController DC1.Ferrari.com set-mailbox $gm.identity -emailaddresspolicyenabled $false set-mailbox $gm.identity -emailaddresses $gm.emailaddresses ############################################ } This should work for you. After modifying the recipient type details Please run the following shell command and check the linked master account value Get-Mailbox -identity "Mailbox" | fl LinkedMasteraccount If you find it shows the linked master account that means, User from the account forest can still access the mailbox.Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread. Hasnain Shaikh| My blogs: http://messagingserversupport.com

Hi If other's advice is helpful to your case. Please mark his answer.Terence Yu TechNet Community Support