title: Powershell: Dynamic Distribution Group filtered by Office attribute
body: <p>I've made several DDG's, but I'm having a bugger of a time using a recipient filter for the Office attribute.  We are running Exchange 2007 SP3.  I've tried lots of variations on the filter, trying to make it even simpler, but to no avail.  I can use attributes like postalcode or title and works as designed.</p>
  
  <pre><code>New-DynamicDistributionGroup -Name DDG-TEST `
      -Alias DDG-TEST `
      -RecipientFilter { RecipientType -eq 'UserMailbox' -and Office -eq 'Chicago' } `
      -DisplayName DDG-TEST `
      -OrganizationalUnit  "OU=TEST,DC=domain,DC=local`
      -RecipientContainer "domain.local/District" `
      -DomainController "dc.domain.local"
  </code></pre>
  
  <p>The DDG creates fine, but there are no members.  I've queried for those same users like below, and I get 79 users.  </p>
  
  <pre><code>Get-ADObject -Filter ("physicalDeliveryOfficeName -eq 'Chicago'")
  </code></pre>
  
  <p>Anyone have similar issues?  I swear I've scoured the inter-tubes and I've looked at other peoples code and I don't see anything that's amiss.  Thanks for your help!</p>