2.2.29 [RFC5545] Section 3.3.3, Calendar User Address

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The specification describes the CAL-ADDRESS data type.

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

On export, Outlook either uses a MAILTO URI, as specified in [RFC2368], or the string "invalid:nomail".

On import, Outlook's handling of illegal values for CAL-ADDRESS properties is documented on a property-by-property basis in this specification.