Add description to AD contact and bulk add description for contacts - Active Directory PowerShell
  Add description to AD contact- Active Directory PowerShell   To update a single contact with description     Get-adobject -filter {mail -eq  "user@domain.com"} | set-adobject -description "contract employee"     Bulk add description for contacts   Create a csv file (contact_desc.csv) for the contacts with their external email address and description. The Column names as in the below snapshot . Open Active directory powershell as an administrator and run the below command to update the contacts with description.          $users = Import-Csv contact_desc.csv   foreach($user in $users)   {   $ExternalEmailAddresses=$User.ExternalEmailAddress   $des1=$user.des   Get-adobject -filter {mail -eq $ExternalEmailAddresses} | set-adobject -description $des1   }