Get-aduser -Properties * -Filter * -SearchBase "ou=OU2,OU=OU1,DC=contoso,DC=com" |Set-ADuser -add @{extensionAttribute8='live@edu'} -server server1.contoso.com
Get-aduser -Properties * -Filter * -SearchBase "ou=OU2,OU=OU1,DC=contoso,DC=com" |Set-ADuser -add @{extensionAttribute8='live@edu'} -server server1.contoso.com