[tz] VTIMEZONEs and Outlook

Ken Murchison murch at fastmail.com
Tue Jul 9 20:28:00 UTC 2019


Sorry for the off-topic post, but I'm fishing.

I'm one of the maintainers of vzic, a utility to convert IANA tzdata 
into iCalendar VTIMEZONE components.  In the process of tweaking the 
tool to handle recent tzdata changes and to generate more 
correct/compact VTIMEZONEs in "pure" mode, I managed to break the 
generation of Outlook-compatible VTIMEZONEs.

Does anyone know what parts of the iCalendar/VTIMEZONE spec that Outlook 
doesn't properly handle and/or know what the requirements are to be 
compatible with Outlook?

Ken Murchison
Cyrus Development Team
Fastmail US LLC

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