I have an event with a reminder. When I create the event, the reminder works fine. However, when I update the event (and try to update the reminder at the same time), the event (vevent) updates correctly, but the reminder (valarm, specifically the trigger) does not change. Note, when I remove the valarm from the update event the reminder is set back to it's default of 15 minutes. Can I update a valarm in Outlook? I've tested this in Outlook 2013. (I don't have any previous versions of Outlook to test this with.)
create.ics:
BEGIN:VCALENDAR
VERSION:2.0
CALSCALE:GREGORIAN
METHOD:PUBLISH
BEGIN:VEVENT
UID:Prosperity-ecomm_sub_dev/_admin-476
DTSTART:20140328T140000Z
DTEND:20140328T160000Z
DESCRIPTION:Course: Test Course 14 (classroom)\nFriday, Mar 28: Test Classroom 1, 10:00 AM - 12:00 PM;
LOCATION:Test Classroom 1
SUMMARY:Test Course 14 (classroom)
SEQUENCE:0
TRANSP:OPAQUE
BEGIN:VALARM
TRIGGER:-PT30M
ACTION:DISPLAY
END:VALARM
END:VEVENT
END:VCALENDAR
update.ics
BEGIN:VCALENDAR
VERSION:2.0
CALSCALE:GREGORIAN
METHOD:REQUEST
BEGIN:VEVENT
UID:Prosperity-ecomm_sub_dev/_admin-476
DTSTART:20140328T150000Z
DTEND:20140328T170000Z
ORGANIZER:donotreply@test.com
DESCRIPTION:Course: Test Course 14 (classroom)\nFriday, Mar 28: Test Classroom 1, 11:00 AM - 1:00 PM;
LAST-MODIFIED:20140305T160100Z
LOCATION:Test Classroom 1
SUMMARY:Test Course 14 (classroom)
SEQUENCE:1
TRANSP:OPAQUE
BEGIN:VALARM
TRIGGER:-PT20M
ACTION:DISPLAY
END:VALARM
END:VEVENT
END:VCALENDAR