Hi all,
I am trying to create an ics file to import calendar entries into MS-Outlook and Google Calendar.

All works well, but whenever I import the events into Outlook, it delete the whole existing calendar, and replaces it with the new entries from the file. This way I can't do any updates to events or add only new ones. What must/can I change in the ics file in order to force Outlook to only update/add events?

Help appreciated

cheers
Patrick

example code below:
BEGIN:VCALENDAR
PRODID:-//Microsoft Corporation//Outlook 12.0 MIMEDIR//EN
VERSION:2.0
METHOD:PUBLISH
X-CALSTART:20101201T000000
X-CALEND:20101231T000000
X-WR-RELCALID:{00000018-358A-8A1C-E11C-05397DB8F537}
X-WR-CALNAME:Patrick Leysen
X-PRIMARY-CALENDAR:TRUE

BEGIN:VEVENT
CLASS:PUBLIC
CREATED:20101216T093000
DESCRIPTION:blabla.\n
DTEND:20101216T093500
DTSTAMP:20101207T132039
DTSTART:20101216T093000
LAST-MODIFIED:20101216T093000
LOCATION:Holland
PRIORITY:5
SEQUENCE:0
SUMMARYA test subject
TRANSP:OPAQUE
UID:TEST_979820
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 08.00.0681.000">\n<TITLE></TITLE>\n</HEAD>\n<BODY>\n<!-- Converted f
rom text/rtf format -->\n\n<P DIR=LTR><SPAN LANG="en-us"><FONT FACE="Calib
ri">blabla.</FONT></SPAN></P>\n\n</BOD
Y>\n</HTML>
X-MICROSOFT-CDO-BUSYSTATUS:BUSY
X-MICROSOFT-CDO-IMPORTANCE:1
X-MICROSOFT-DISALLOW-COUNTER:FALSE
X-MS-OLK-ALLOWEXTERNCHECK:TRUE
X-MS-OLK-AUTOFILLLOCATION:FALSE
X-MS-OLK-CONFTYPE:0
END:VEVENT

END:VCALENDAR