On Thu, Nov 17, 2016 at 03:48:01PM +0100 you wrote:

> Could you provide the raw source of that event?

I entered two events, one in Outlook, one in Thunderbird.

As recurring rules I chose:
Every 2nd month on the 4th friday ending on 2017-03-31.

If I open the event entered in Outlook in Thunderbird, I get:
Every 2nd month on each friday, 3 events (without end date).

If I open the event entered in Thunderbird in Outlook, I get:
Every month on the 4th friday ending on 2017-03-31

To get raw data I copied the Thunderbird event to clipboard and
inserted it here. To get raw data from Outlook I forwarded the event
as mail attachment.

Raw data Thunderbird event:

BEGIN:VCALENDAR
PRODID:-//Mozilla.org/NONSGML Mozilla Calendar V1.1//EN
VERSION:2.0
BEGIN:VTIMEZONE
TZID:Europe/Berlin
BEGIN:DAYLIGHT
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
TZNAME:CEST
DTSTART:19700329T020000
RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=3
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
TZNAME:CET
DTSTART:19701025T030000
RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=10
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
CREATED:20161123T140058Z
LAST-MODIFIED:20161123T140058Z
DTSTAMP:20161123T140058Z
UID:6cd9d3d5-92de-4fab-8d23-79481dd42de3
SUMMARY:Thunderbird
RECURRENCE-ID;TZID=Europe/Berlin:20161125T083000
DTSTART;TZID=Europe/Berlin:20161125T083000
DTEND;TZID=Europe/Berlin:20161125T090000
TRANSP:OPAQUE
DESCRIPTION:every 2nd month on the 4th Friday until 2017-03-31 (Thunderbir
 d)\n
CLASS:CONFIDENTIAL
SEQUENCE:3
X-MOZ-GENERATION:2
END:VEVENT
END:VCALENDAR

Raw data Outlook event:

BEGIN:VCALENDAR
PRODID:-//Microsoft Corporation//Outlook 15.0 MIMEDIR//EN
VERSION:2.0
METHOD:REQUEST
X-MS-OLK-FORCEINSPECTOROPEN:TRUE
BEGIN:VTIMEZONE
TZID:W. Europe Standard Time
BEGIN:STANDARD
DTSTART:16011028T030000
RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=10
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
END:STANDARD
BEGIN:DAYLIGHT
DTSTART:16010325T020000
RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=3
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
END:DAYLIGHT
END:VTIMEZONE
BEGIN:VEVENT
CLASS:PUBLIC
CREATED:20161123T140607Z
DESCRIPTION:Every 2nd month every 4th Friday until 2017-03-31\n
DTEND;TZID="W. Europe Standard Time":20161125T103000
DTSTAMP:20161123T140607Z
DTSTART;TZID="W. Europe Standard Time":20161125T100000
LAST-MODIFIED:20161123T140607Z
ORGANIZER;CN=R.C.:mailto:[email protected]
PRIORITY:5
RRULE:FREQ=MONTHLY;COUNT=3;INTERVAL=2;BYDAY=FR;BYSETPOS=4
SEQUENCE:0
SUMMARY;LANGUAGE=de:Outlook
TRANSP:TRANSPARENT
UID:040000008200E00074C5B7101A82E00800000000C0FEA9949845D201000000000000000
        010000000A482517E94E8A1429D5907035B3F7B22
X-ALT-DESC;FMTTYPE=text/html:<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//E
        N">\n<HTML>\n<HEAD>\n<META NAME="Generator" CONTENT="MS Exchange Server 
ve
        rsion rmj.rmm.rup.rpr">\n<TITLE></TITLE>\n</HEAD>\n<BODY>\n<!-- 
Converted 
        from text/rtf format -->\n\n<P DIR=LTR><SPAN LANG="de"></SPAN><SPAN 
LANG="
        en-us"><FONT FACE="Calibri">Every 2nd month every 4th Friday until 
2017-03
        -31</FONT></SPAN></P>\n\n</BODY>\n</HTML>
X-MICROSOFT-CDO-BUSYSTATUS:FREE
X-MICROSOFT-CDO-IMPORTANCE:1
X-MICROSOFT-DISALLOW-COUNTER:FALSE
X-MS-OLK-AUTOFILLLOCATION:TRUE
X-MS-OLK-CONFTYPE:0
END:VEVENT
END:VCALENDAR


Regards
-- 
R. Cirksena 
-- 
[email protected]
https://inverse.ca/sogo/lists

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