2.2.27 [RFC5545] Section 3.3.1, Binary

V0035:

The specification describes the BINARY data type.

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

On import, Outlook ignores any properties of type BINARY that do not use the "BASE64" value for the ENCODING parameter. Outlook also ignores any properties of type BINARY that contain characters that are invalid in base64 encoding. Outlook attempts to parse values that are improperly padded, but ignores the property if it cannot parse the value.