Exchange 2007 New-Mailbox Error: The object already exists

Posted on 2009-04-21
Last Modified: 2012-05-06
I am trying to create a new shared mailbox via the Exchange 2007 Management Shell using the new-mailbox cmdlet. I have created a shared mailbox before with this same command and it has worked perfect. I think it has something to do with the '-userprincipalname' parameter because if I change it to something else the account will get created with no issues. Here is the cmd I'm trying to use (with server info defaulted):

new-mailbox -alias "service" -name "Service" -database "exchange\first storage group\mailbox database" -org "domain.local/Organizational Unit" -shared -userprincipalname "service@domain.local"

I get the following error when I execute that:
New-Mailbox : Active Directory operation failed on exchange.domain.local. The object 'CN=Service,OU=Organizational Unit,DC=domain,DC=local' already exists. At Line:1 char:12.

I had setup a secondary SMTP address '' or 'service@domain.local' on a domain user account so they received mail from those email addresses but I have since removed it from the associated domain user account because I want to separate it into a shared mailbox instead. I have restarted the exchange server but I still get this error. Do I need to reboot the Domain Controller?
I dont know if it matters - but I have installed the recent Windows update on the Domain Controller but I have not reset it yet.
Question by:total_communication
    LVL 65

    Expert Comment

    It can take a couple of hours for an email address to replicate out of the domain before you can reassign it. Restarting the domain controllers will not speed that process up unfortunately.


    Author Comment

    I will remove it tonight and check tomorrow morning to see if I can create it. I will post back tomorrow to see if that fixed it.

    Author Comment

    I retried adding the new shared mailbox and I get the same error.
    I just dont get way it says it exists when I cannot find it anywhere. I tried searching Active Directory for Service but it doesnt exist also I tried searching for the email address and user principal name but still turns up there something wrong with my 'new-mailbox' command?
    LVL 65

    Accepted Solution

    I am sure that "Service" is a special name that you cannot use.
    You will need to use another name for the account. However I think that you can use service as the email address, just not as the object name.


    Author Closing Comment

    You are correct Simon. I had actually did exactly what you said this morning after I posted my comment and that solution worked. I couldnt find the Service account anywhere in AD or on the local computer but I believe it is a hidden Windows system account; to test this I tried to add security permissions to a file or folder and I can used the name 'service' and click 'check name' it comes back and is underlined indicating that it is an account. Just wanted to let you and everyone else know how I tested your solution. Thanks again for your help.

    Chris Lucyshyn

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