Adding and removing extensionattribute to AD object

Question

I\'m using powershell to modify some AD extensionattribute.

This is my code to add an extensionattribute

Set-ADUser -Identity \"anyUser\" -Add @{exte         


        

Answer 1

I used the following today - It works!

Add a value to an extensionAttribute

 $ThisUser = Get-ADUser -Identity $User -Properties extensionAttribute1
    Set-ADUser –Identity $ThisUser -add @{"extensionattribute1"="MyString"}

Remove a value from an extensionAttribute

  $ThisUser = Get-ADUser -Identity $User -Properties extensionAttribute1
  Set-ADUser –Identity $ThisUser -Clear "extensionattribute1" 

Answer 2

To clear the value you can always reset it to $Null. For example:

Set-Mailbox -Identity "username" -CustomAttribute1 $Null

Answer 3

You could try using the -Clear parameter

Example:-Clear Attribute1LDAPDisplayName, Attribute2LDAPDisplayName

http://technet.microsoft.com/en-us/library/ee617215.aspx

Answer 4

Or the -Remove parameter

Set-ADUser -Identity anyUser -Remove @{extensionAttribute4="myString"}

Answer 5

Set-ADUser -Identity anyUser -Replace @{extensionAttribute4="myString"}

This is also usefull

Answer 6

Extension attributes are added by Exchange. According to this Technet article something like this should work:

Set-Mailbox -Identity "anyUser" -ExtensionCustomAttribute4 @{Remove="myString"}