UPN Issue when running AD Prep as per MS guidelines in readiness for upgrade to Exchange 2013
I get the following error when running this syntax : setup.exe /PrepareAD ?IAcceptExchangeServerLicenseTerms
Organization Preparation FAILED
The following error was generated when "$error.Clear();
$arbMbxname = [Microsoft.Exchange.Management.RecipientTasks.EnableMail
box]::DiscoveryMailboxUniqueName;
$arbMbxLastName = "MsExchDiscoveryMailbox XXXXXXXX-XXXX-XXXX-XXXX-XXXX
XXXXXXX";
$arbUser = @(Get-User -Filter {LastName -eq $arbMbxLastName} -IgnoreDe
faultScope -ResultSize 1);
if ($arbUser.Length -eq 0)
{
Install-UserAccount -Name $arbMbxname -LastName $arbMbxLastName;
}
" was run: "An Active Directory Constraint Violation error occurred on <FQDN>. Additional information: The operation failed becaus
e UPN value provided for addition/modification is not unique forest-wide.
Active directory response: 000021C8: AtrErr: DSID-03200BF6, #1:
0: 000021C8: DSID-03200BF6, problem 1005 (CONSTRAINT_ATT_TYPE), data 0,
Att 90290 (userPrincipalName)
".