GetMessage(s) - What Message is Fetched for Index = 0?

[Yossi-G]

When I am fetching messages from an Inbox which contains multiple messages, is there a deterministic order in which these messages are fetched?

If I fetch one message, using Index 0 do I get the earliest message, the latest message or is this undefined?

Similarly, if I fetch ALL messages using GetMessages and then iterate through the list returned, is there a deterministic order in which I will process these messages?

Thanks for your advice!