2.2.42 [RFC5545] Section 3.5, Property

V0052:

The specification imposes no ordering of properties within an iCalendar object.

Microsoft Office Outlook 2007, Microsoft Outlook 2010, Microsoft Outlook 2013, Microsoft Outlook 2016, Microsoft Outlook 2019  

On export, Outlook always orders properties before sub-components.

On import, Outlook parses properties and sub-components in any order, provided that the component hierarchy is correct.

V0053:

The specification specifies that property names, parameter names, and enumerated parameter values are case-insensitive.

Office Outlook 2007, Outlook 2010, Outlook 2013, Outlook 2016, Outlook 2019  

On export, Outlook always uses capital letters for property names, parameter names, component names, and enumerated values.