2.2.53 [RFC5545] Section 3.7.4, Version
V0085:
The specification states that non-standard property parameters can be specified on the VERSION property.
Microsoft Office Outlook 2007, Microsoft Outlook 2010, Microsoft Outlook 2013
Outlook does not export non-standard property parameters on the VERSION property, and ignores all parameters on the VERSION property on import.
V0086:
The specification states that the VERSION property MUST be specified by an iCalendar object, but MUST be specified only once.
Office Outlook 2007, Outlook 2010, Outlook 2013
On import, Outlook treats an iCalendar object with a missing VERSION property as if the VERSION property were set to "2.0". If multiple VERSION properties are found, then any VERSION properties beyond the first are ignored.
V0087:
The specification states that a value of "2.0" for the VERSION property corresponds to [RFC5545].
Office Outlook 2007, Outlook 2010, Outlook 2013
On export, Outlook sets the VERSION property to "2.0".
On import, Outlook treats any value of VERSION other than "1.0" as if it were set to "2.0". If the value is set to "1.0", then the data is not parsed as an iCalendar, and is instead redirected to Outlook's vCalendar parser.
C0014:
The specification uses the terms maxver and minver within the ABNF notation used to describe the format of the VERSION property. These terms are described as "A IANA registered iCalendar version identifier."
Office Outlook 2007, Outlook 2010, Outlook 2013
Outlook fails to parse VERSION properties that specify both a minver and maxver. In this scenario, the VERSION property is ignored and Outlook uses a default value of "2.0".
Because no versions other than "2.0" are currently registered with IANA, Outlook's behavior is conformant with this section. However, if another version were to be registered with IANA, Outlook's behavior would no longer be conformant.