How to get property tag for some outlook item properties

Hi Iret,

I am trying to get a few properties for appointment (such as "All day event","Recurrence", "Location") and activity (such as "Duration", "Company"), I did some test and found out that the property tag I get for these properties are not consistent from message to message. e.g. Duration for activity item can be 0x8236003, 0x80050003, 0x80180003... and probably more. Looks like Outlook saves the same kind of information to a different property tag everytime, can you tell me why this is the case and is there a way in Aspose to get those properties consistently?

Thanks for you help in advance.