Having problems with UTF-8 encoding from WinPhone

Question

Our sync server (GroupWise Mobility Server) - which supports EAS 14 - is failing to sync an item from a Windows Phone to our email application's calendar.
As we look at the .ics file created by the Windows Phone, we notice that some characters are not UTF-8 characters as claimed (see .ics file below) and thus, do not decode properly and we drop the sync request.
.ics file contents:
BEGIN:VCALENDAR
METHOD:REQUEST
PRODID:Microsoft Windows Phone
VERSION:2.0
BEGIN:VTIMEZONE
TZID:Öйú±ê׼ʱ¼ä
BEGIN:STANDARD
DTSTART:20000101T000000
TZOFFSETFROM:+0800
TZOFFSETTO:+0800
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
SUMMARY;CHARSET=UTF-8:好吧
DESCRIPTION;CHARSET=UTF-8:我们俩人呢
CLASS:PUBLIC
LOCATION;CHARSET=UTF-8:嗯嗯
UID:040000008200E00074C5B7101A82E00800000000B0AE9BBDCCB0E642A1A016ED65B5498
 0100000001A7F45FD22126646A347826899970D56
DTSTART;TZID=Öйú±ê׼ʱ¼ä:20141024T160000
DTEND;TZID=Öйú±ê׼ʱ¼ä:20141024T170000
X-MICROSOFT-DISALLOW-COUNTER:FALSE
X-MICROSOFT-CDO-ALLDAYEVENT:FALSE
STATUS:CONFIRMED
ATTENDEE;ROLE=REQ-PARTICIPANT;PARTSTAT=DELEGATED;CN=¨¹?? ¨¹??:MAILTO:deu02@
 mydo43.com
ATTENDEE;ROLE=REQ-PARTICIPANT;PARTSTAT=NEEDS-ACTION;CN=user01 user01:MAILTO
 :[email protected]
ORGANIZER:MAILTO:[email protected]
DTSTAMP:20141024T075407Z
LAST-MODIFIED:20141024T075407Z
BEGIN:VALARM
ACTION:DISPLAY
DESCRIPTION:REMINDER
TRIGGER:-PT15M
END:VALARM
END:VEVENT
END:VCALENDAR

Answer 1

We just took the Content-Type text/calendar portion, decoded it and this is what we were referring to as the meeting.ics.  
Here is the MIME that the Windows 8 Phone sends:
MIME-Version: 1.0
To: =?utf-8?Q?=C3=BC=C3=B6=C3=A4_=C3=BC=C3=B6=C3=A4?= <[email protected]>,
        user01 user01 <[email protected]>
Subject: =?utf-8?B?5aW95ZCn==?=
Date: Fri, 24 Oct 2014 15:54:07 +0800
Thread-Topic: =?utf-8?Q?=E5=A5=BD=E5=90=A7?=
Content-Type: multipart/alternative;
        boundary="_6504CEF0-3696-4407-8129-C93E3F2622A6_"
X-GWTO-BUFFER: =?utf-8?Q?=C3=BC=C3=B6=C3=A4_=C3=BC=C3=B6=C3=A4?=; user01 user01
--_6504CEF0-3696-4407-8129-C93E3F2622A6_
Content-Transfer-Encoding: base64
Content-Type: text/plain; charset="utf-8"
5oiR5Lus5L+p5Lq65ZGi
--_6504CEF0-3696-4407-8129-C93E3F2622A6_
Content-Type: text/calendar; charset="utf-8"; method=REQUEST
Content-Transfer-Encoding: base64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--_6504CEF0-3696-4407-8129-C93E3F2622A6_--
When you decode the text/calendar data, this is where you will find the characters that are not valid UTF-8.