is there a way I can update the custom attribute to 500 account all at once, via PowerShell?

There are multiple ways using powershell or you can always use admodify and use the custom tab and enter your custom attribute. Programmatically manipulate AD user attributes with PowerShell http://dmitrysotnikov.wordpress.com/2007/07/16/programmatically-manipulate-ad-user-attributes-with-powershell/ One step further - PowerShell script to modify multiple users' property in Active Directory http://myitforum.com/cs2/blogs/yli628/archive/2007/09/11/one-step-further-powershell-script-to-modify-multiple-users-property-in-active-directory.aspx Admodify http://admodify.codeplex.com/James Chong MCITP | EA | EMA; MCSE | M+, S+ Security+, Project+, ITIL msexchangetips.blogspot.com

Hello, do you want to change the attribute for all your users? Then you can perform this command: Get-Mailbox | Set-Mailbox -CustomAttribute1 ... You can also set CustomAttribute2, CustomAttribute3 etc. Greetings, Toni

If you have all your users in a CSV file with a header of User, for example, just run the following: Import-Csv C:\users.csv | ForEach {Set-Mailbox $_.User -CustomAttribute1 "Sales users"} Or if your CSV has multiple columns like User and Department, we can use that to set the CustomAttribute that you want: Import-Csv C:\users.csv | ForEach {Set-Mailbox $_.User -CustomAttribute1 $_.Department} http://LetsExchange.blogspot.com

Hi Viministrator, Any updates? Frank Wang Forum Support Please remember to mark the replies as answers if they help and unmark them if they provide no help. If you have feedback for TechNet Subscriber Support, contact tnmff@microsoft.com.

Hi Viministrator, Any updates? Frank Wang