X-MICROSOFT-*-ALLDAYEVENT

lib/event.js

@@ -626,6 +626,9 @@ var ICalEvent = function(_data, cal) {
             if(data.end) {
                 g += 'DTEND;VALUE=DATE:' + tools.formatDate(data.end, true) + '\r\n';
             }
+
+            g += 'X-MICROSOFT-CDO-ALLDAYEVENT:TRUE\r\n';
+            g += 'X-MICROSOFT-MSNCALENDAR-ALLDAYEVENT:TRUE\r\n';
         } else {
             g += tools.formatDateTZ('DTSTART', data.start, data) + '\r\n';
             if(data.end) {

test/results/generate_03.ics

@@ -7,6 +7,8 @@ SEQUENCE:0
 DTSTAMP:20131004T233453Z
 DTSTART;VALUE=DATE:20131004
 DTEND;VALUE=DATE:20131006
+X-MICROSOFT-CDO-ALLDAYEVENT:TRUE
+X-MICROSOFT-MSNCALENDAR-ALLDAYEVENT:TRUE
 SUMMARY:Sample Event
 ORGANIZER;CN="Sebastian Pekarek":mailto:mail@sebbo.net
 URL;VALUE=URI:http://sebbo.net/

test/results/generate_06.ics

@@ -7,6 +7,8 @@ SEQUENCE:0
 DTSTAMP:20131004T233453Z
 DTSTART;VALUE=DATE:20131004
 DTEND;VALUE=DATE:20131006
+X-MICROSOFT-CDO-ALLDAYEVENT:TRUE
+X-MICROSOFT-MSNCALENDAR-ALLDAYEVENT:TRUE
 SUMMARY:Sample Event
 ORGANIZER;CN="Sebastian Pekarek":mailto:mail@sebbo.net
 ATTENDEE;ROLE=REQ-PARTICIPANT;PARTSTAT=ACCEPTED;DELEGATED-FROM="matt@example.com";CN="John":MAILTO:john@example.com