Hi,
On Microsoft's documentation for the Outlook Add-in requirement set for 1.5 (https://docs.microsoft.com/en-us/office/dev/add-ins/reference/objectmodel/requirement-set-1.5/outlook-requirement-set-1.5) one of the notes says
Added support for calling REST APIs.
Which is clear. However, when I look at the API reference for Requirement Set 1.4 (https://docs.microsoft.com/en-us/javascript/api/outlook/office.mailbox?view=outlook-js-1.4&preserve-view=true#converttorestid-itemid--restversion-) I notice there convertToRestId() method which implies REST support. There are other methods and properties in 1.4 to allude to REST support.
I am confused as to the difference between 1.4 and 1.5 as it pertains to REST support and would love pointers or clarification (even high-level) on what is the actual difference.
.