2.2.91 [RFC5545] Section 3.8.7.3 Last Modified

V0201:

The specification describes the LAST-MODIFIED ([MS-OXCICAL] section 2.1.3.1.1.20.14) property.

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

Microsoft Exchange Server does not implement the LAST-MODIFIED property. Microsoft Exchange does not import or export the LAST-MODIFIED property.