title: Outlook ICS / iCalendar: No Field ("To:") for further Attendees when Organizer is set?
body: <p><strong>My goal:</strong></p>
  <ul>
  <li><strong>(Step 1)</strong> Open ICS file in Outlook, so the user can send a generated meeting/appointment to recipients of his or her choice. Therefore I use the PUBLISH method. It is pretty much what is explained here: <a href="https://www.rfc-editor.org/rfc/rfc2446#section-4.1.1" rel="nofollow noreferrer">https://www.rfc-editor.org/rfc/rfc2446#section-4.1.1</a></li>
  <li><strong>(Step 2)</strong> Let user update scheduled meeting via ICS (this should be 4.1.2 in the RFC).</li>
  </ul>
  <p><strong>Requirements deadlock each other:</strong></p>
  <ul>
  <li>In order to update a scheduled meeting, I need to set an ORGANIZER.</li>
  <li>If ORGANIZER is set though, there will be no field to enter recipients (Step 1).</li>
  </ul>
  <p><strong>This is what my ICS looks like on first publish:</strong></p>
  <pre><code>BEGIN:VCALENDAR
  PRODID:MyProg
  METHOD:PUBLISH
  BEGIN:VEVENT
  UID:{9D3C6B93-D935-44EA-A4CD-498900BCFEFD}
  SEQUENCE:1
  PRIORITY:5
  ATTENDEE;RSVP=TRUE:mailto: 
  DTSTAMP:20121107T183153Z
  DTSTART:20121107T190000Z
  DTEND:20121107T193000Z
  SUMMARY:This is the Subjectline
  LOCATION:Room 1
  DESCRIPTION:Hello, please join my presentation.
  ORGANIZER:mailto:abc@bcd.com
  END:VEVENT
  END:VCALENDAR
  </code></pre>
  <p>Purpose of the line starting with ATTENDEE is to make the &quot;To:&quot; field appear.<br />
  If the line with ORGANIZER is omitted, Step 2, the update, won't work.<br />
  If ORGANIZER is set, there will be no field to fill in recipients...</p>
  <p><strong>This is what my ICS looks like on second publish to update the first publish:</strong></p>
  <pre><code>BEGIN:VCALENDAR
  PRODID:MyProg
  METHOD:PUBLISH
  BEGIN:VEVENT
  UID:{9D3C6B93-D935-44EA-A4CD-498900BCFEFD}
  SEQUENCE:0
  PRIORITY:5
  ATTENDEE;RSVP=TRUE:mailto: 
  DTSTAMP:20121107T184400Z
  DTSTART:20121107T190000Z
  DTEND:20121107T193000Z
  SUMMARY:This is the MODIFIED SUBJECT
  LOCATION:Room 1
  DESCRIPTION:Hello, please join my presentation.
  ORGANIZER:mailto:abc@bcd.com
  END:VEVENT
  END:VCALENDAR
  </code></pre>
  <p>Has equal UID and incremented SEQUENCE and DTSTAMP as required! Won't work if ORGANIZER is omitted.</p>
  <hr />
  <p>Are there any suggestions for me to fulfill my goals Step 1 &amp; 2 with update capability and without losing the recipients field &quot;To:&quot;??</p>
  <p>Thank you so much in advance!</p>
  <hr />