title: Adding a string to a extensionattribute in Powershell
body: <p>I try to add value X to a Active Directory Member Y that has already some values in extensionAttribute10. How do I add a specific string into that? Also I want to scan the extensionAttribute and remove a specific entry.</p>
  <pre><code>Testparameters:
  $ThisUser = &quot;Testaccount01&quot;
  @{extensionAttribute10=Computer01, Computer02}
  $adding = &quot;Computer03&quot;
  $delete = &quot;Computer01&quot;
  </code></pre>