2.2.6 [RFC5545] Section 3.2.1, Alternate Text Representation

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C0002:

The specification is unclear on whether the ALTREP parameter is required or optional.

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

Outlook ignores this parameter on import and does not export it.