Why am I getting this? Anyone know a workaround? Get-MailUser -OrganizationalUnit "..." -IgnoreDefaultScope | Set-MailUser -IgnoreDefaultScope -CustomAttribute2 "..." Set-MailUser : The operation failed on recipient "..." because there were some invalid arguments, which lead to the change of its type from "MailUser" to "UserMailbox". Please correct your input. At line:1 char:119 + Get-MailUser -OrganizationalUnit "..." -IgnoreDefaultScope | Set-MailUser <<<< -IgnoreDefaultScope -CustomAttribute2 "..." + CategoryInfo : InvalidArgument: (...:ADObjectId) [Set-MailUser], InvalidOperationException + FullyQualifiedErrorId : 70F3D023,Microsoft.Exchange.Management.RecipientTasks.SetMailUserDavid Jenkins

Something wrong with your syntax For the -OrganisationalUnit you haven't specified the OU? Sukh

Hi David, If you just run the cmdlet Get-MailUser -OrganizationalUnit "..." -IgnoreDefaultScope, will the result be expected? Please try to run the cmdlet Set-MailUser -Identity "mailuser" -IgnoreDefaultScope -CustomAttribute2 "..." for the specific MailUser to see whether it works. Frank Wang

I removed the OU on purpose for posting. Just imagine it is there.David Jenkins

Hi David, If you just run the cmdlet Get-MailUser -OrganizationalUnit "..." -IgnoreDefaultScope, will the result be expected? Please try to run the cmdlet Set-MailUser -Identity "mailuser" -IgnoreDefaultScope -CustomAttribute2 "..." for the specific MailUser to see whether it works. Frank Wang

Can you post the exact command you're trying. Matbe edit out the OU but keep the format the same? Also, have you trued what Frank suggested?Sukh

Hi David, Any updates? Frank Wang