2.1.2 [RFC5545] Section 3.3.10, BYSECOND, BYMINUTE, and BYHOUR Rule Parts MUST Be Ignored in RECUR Value When DTSTART Has a DATE Value Type

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The specification states, "The BYSECOND, BYMINUTE and BYHOUR rule parts MUST NOT be specified when the associated 'DTSTART' property has a DATE value type. These rule parts MUST be ignored in RECUR value that violate the above requirement (e.g., generated by applications that pre-date this revision of iCalendar)."

Outlook will fail to import iCalendar objects that contain RECUR values that contain a BYSECOND, BYMINUTE, or BYHOUR rule part.