POA12.02, client 12.02

We had reports of this from a couple admin assistants.
When making changes to appointments with outside exchange users, the outside users were getting cancellation notices. I'l simply say, no one was happy when board members missed board meetings....

I was able to replicate pretty easily.

I create an appointment for myself and add an external user- my personal gmail account. I edit the appt and add a second external user, and the gmail account gets a meeting cancelled notice.

I edit the appointment again and the gmail user gets another meeting cancelled notice.

All I did was just edit appointment, send.
Code:
                                                                                                                                                                                                                                                               
Delivered-To: mypersonalgmailaccount@gmail.com
Received: by 10.76.144.166 with SMTP id sn6csp418161oab;
        Thu, 28 May 2015 11:53:02 -0700 (PDT)
X-Received: by 10.42.152.67 with SMTP id h3mr10984180icw.56.1432839181677;
        Thu, 28 May 2015 11:53:01 -0700 (PDT)
Return-Path: <myworkemailaccount.com>
Received: from GroupWiseMTA (GroupWiseMTA. [gwiaIPaddress])
        by mx.google.com with ESMTPS id vs16si2912748icb.52.2015.05.28.11.53.01
        for <mypersonalgmailaccount@gmail.com>
        (version=TLSv1 cipher=RC4-SHA bits=128/128);
        Thu, 28 May 2015 11:53:01 -0700 (PDT)
Received-SPF: neutral (google.com: gwiaIPaddress is neither permitted nor denied by best guess record for domain of myworkemailaccount.com) client-ip=gwiaIPaddress;
Authentication-Results: mx.google.com;
       spf=neutral (google.com: gwiaIPaddress is neither permitted nor denied by best guess record for domain of myworkemailaccount.com) smtp.mail=myworkemailaccount.com
Message-ID: <5567640d.10362b0a.6db0.2760SMTPIN_ADDED_BROKEN@mx.google.com>
X-Google-Original-Message-ID: <@GroupWiseMTA>
R--=__Part2F195300.1__=
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: quoted-printable

Item Type:  Appointment
Start Date:  Sunday, 1 May 2016, 12:00:00pm (CDT)
Duration:  1 Hour
Place:  The office
Action:  Cancelled

--=__Part2F195300.1__=
Content-class: urn:content-classes:calendarmessage
Content-Type: text/calendar; method=CANCEL; name=meeting.ics; charset=UTF-8
Content-Transfer-Encoding: 8bit

BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Novell Inc//Groupwise 12.0.2 
METHOD:CANCEL
BEGIN:VTIMEZONE
TZID:(GMT-0600) CST
BEGIN:STANDARD
TZOFFSETFROM:-0500
TZOFFSETTO:-0600
DTSTART:20001101T020000
RRULE:FREQ=YEARLY;BYDAY=1SU;BYMONTH=11
TZNAME:CST
END:STANDARD
BEGIN:DAYLIGHT
TZOFFSETFROM:-0600
TZOFFSETTO:-0500
DTSTART:20000308T020000
RRULE:FREQ=YEARLY;BYDAY=2SU;BYMONTH=3
TZNAME:Daylight Savings Time
END:DAYLIGHT
END:VTIMEZONE
BEGIN:VEVENT
DTSTART;TZID="(GMT-0600) CST":20160501T120000
X-GWITEM-TYPE:APPOINTMENT
ORGANIZER;CN="Francisco Diaz";ROLE=CHAIR:MAILTO:myworkemailaccount.com
ATTENDEE;CN="Francisco Diaz";ROLE=REQ-PARTICIPANT:
 MAILTO:myworkemailaccount.com
ATTENDEE;CN="mypersonalgmailaccount";ROLE=REQ-PARTICIPANT:
 MAILTO:mypersonalgmailaccount
STATUS:CANCELLED
SUMMARY:lunchtime
DTEND;TZID="(GMT-0600) CST":20160501T130000
LOCATION:The office
DTSTAMP:20160501T170000Z
UID:20150528T185027Z_2B3800A32E3
END:VEVENT
END:VCALENDAR
Thanks in advance,

Frank