2.2.40 [RFC5545] Section 3.3.14, UTC Offset

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The specification describes the UTC-OFFSET data type.

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

On import, Outlook attempts to approximate the value of invalid UTC-OFFSET values. If it cannot approximate the value, then it ignores the property.