title: Outlook Property Accessor error: The property "ttp://schemas.microsoft.com/mapi/proptag/0x7FFE000B" is unknown or cannot be found
body: <p>I'm using the Outlook property accessor to email attachments.
  This is the Code that I'm using:</p>
  <pre><code> //check whether attachments are there or not
                              if (mailItem.Attachments.Count &gt; 0)
                              {
                                  //loop through all attachments
                                  for (int j = 1; j &lt;= mailItem.Attachments.Count; j++)
                                  {
                                      //check if attachment is email attachment, then only save to local directory
                                      if (mailItem.Attachments[j].PropertyAccessor.GetProperty(&quot;http://schemas.microsoft.com/mapi/proptag/0x7FFE000B&quot;) == false)
                                      {
                                          //save email attachment to local directory
                                          mailItem.Attachments[j].SaveAsFile
                                              (attachmentPath + &quot;\\&quot; +
                                              mailItem.Attachments[j].FileName);
                                      }
                                  }
                              }
  </code></pre>
  <p>It's reading fine for most of the emails, but for a couple of them, I get this error:</p>
  <blockquote>
  <p>The property &quot;ttp://schemas.microsoft.com/mapi/proptag/0x7FFE000B&quot; is unknown or cannot be found.</p>
  </blockquote>
  <p>I want to know what's the fix for this error and if there are any workarounds if the error is thrown?</p>