Why convert ICS to VCS?
VCS is the vCalendar 1.0 standard from 1996 that .ICS replaced in 1998. Some older phones, PDAs, Lotus Notes configurations, and industrial scheduling tools still require the older .vcs format and will not accept a modern .ics file.
How to convert ICS to VCS
Microsoft Outlook APP
Go to File > Open & Export to import the .ics, then open the event and use File > Save As, selecting vCalendar Format (.vcs). Outlook processes one event at a time this way.
About these formats
.ICS
iCalendar data file
An ICS file is a calendar file in the iCalendar format (RFC 5545). It holds events, meeting invitations, tasks, and reminders as plain text. Double-click it to import into your default…
Open .ICS details →
.VCS
vCalendar File
A VCS file is a vCalendar 1.0 appointment - a small plain-text file holding an event's date, time, title, and details. Double-click it to add the event to Outlook, Apple Calendar, or…
Open .VCS details →Quality & what to watch
- VTIMEZONE blocks are not supported by vCalendar 1.0; event times are stored as local time, so time zone information is stripped and times may appear wrong on the receiving device.
- Complex recurrence rules (RRULE) may not convert correctly, as the recurrence syntax changed between iCalendar 2.0 and vCalendar 1.0.
- iCalendar uses UTF-8 encoding; vCalendar 1.0 uses quoted-printable, so accented or non-Latin characters may appear garbled unless re-encoded.
