Timeline for item.isAllDayEvent GA + recommended production alternative?

[Norbert Székely (sznorbert07)]

Hi Add-ins team,
I'm currently evaluating the Office.context.mailbox.item.isAllDayEvent API, which is still marked as Preview in the documentation.
I have two questions:

• Is there an estimated timeline for when isAllDayEvent will reach GA and become part of a stable Outlook requirement set?
• What do you recommend for production add-ins today to reliably detect all‑day appointments until the API becomes GA?

This would help us plan our long-term implementation strategy and avoid relying on preview APIs in production.
Thanks!