What MAPI Property determines if a meeting has not been sent yet?

Question

Does anybody know what MAPI property determines whether a meeting item has not been sent yet? Currently, outlook displays a "Invitations have not been sent for this meeting." message at the top.

(e.g. this is a new meeting item). See screenshot below.

Answer 1

FInvited - it is a PT_BOOLEAN named property with GUID = {00062002-0000-0000-C000-000000000046} (PSETID_Appointment) and id = 0x8229.