V0250:
The specification describes the use of REPLY with VFREEBUSY components.
Microsoft Exchange Server 2007, Microsoft Exchange Server 2010, Microsoft Exchange Server 2013, Microsoft Exchange Server 2016, Microsoft Exchange Server 2019, Microsoft Exchange Server Subscription Edition
Microsoft Exchange Server does not export VFREEBUSY components. Microsoft Exchange ignores VFREEBUSY components on import. For REPLY-type iCalendar objects, the import fails.