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Home/ Questions/Q 36445
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Asked: May 10, 20262026-05-10T14:23:39+00:00 2026-05-10T14:23:39+00:00

I’m generating ICalendar (.ics) files. Using the UID and SEQUENCE fields I can update

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I’m generating ICalendar (.ics) files.

Using the UID and SEQUENCE fields I can update existing events in Google Calendar and in Windows Calendar BUT NOT in MS Outlook 2007 – it just creates a second event

How do I get them to work for Outlook ?

Thanks

Tom

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  1. 2026-05-10T14:23:40+00:00Added an answer on May 10, 2026 at 2:23 pm

    I’ve continued to do some testing and have now managed to get Outlook to update and cancel events based on the .cs file.

    Outlook in fact seems to respond to the rules defined in RFC 2446

    In summary you have to specify

    METHOD:REQUEST and ORGANIZER:xxxxxxxx

    in addition to UID: and SEQUENCE:

    For a cancellation you have to specify METHOD:CANCEL

    Request/Update Example

    BEGIN:VCALENDAR VERSION:2.0 PRODID:-//SYFADIS//PORTAIL FORMATION//FR METHOD:REQUEST BEGIN:VEVENT UID:TS_229377_MS_262145@syfadis.com SEQUENCE:5 DTSTAMP:20081106T154911Z ORGANIZER:catalog@syfadis.com DTSTART:20081113T164907 DTEND:20081115T170000 SUMMARY:TestTraining STATUS:CONFIRMED END:VEVENT END:VCALENDAR 

    Cancel Example;

    BEGIN:VCALENDAR VERSION:2.0 PRODID:-//SYFADIS//PORTAIL FORMATION//FR METHOD:CANCEL BEGIN:VEVENT UID:TS_229377_MS_262145@syfadis.com SEQUENCE:7 DTSTAMP:20081106T154916Z ORGANIZER:catalog@syfadis.com DTSTART:20081113T164907 SUMMARY:TestTraining STATUS:CANCELLED END:VEVENT END:VCALENDAR 
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