2.2.39 [RFC5545] Section 3.4 iCalendar Object

V0049:

The specification allows multiple iCalendar objects to be sequentially grouped together.

Microsoft Exchange Server 2007, Microsoft Exchange Server 2010, Microsoft Exchange Server 2013, Microsoft Exchange Server 2016, Microsoft Exchange Server 2019

On export, Microsoft Exchange Server only exports one VCALENDAR component per MIME part.

On import, Microsoft Exchange fails to import iCalendar objects with multiple VCALENDAR components in a MIME component.