That’s correct about the Clone message limitation. Sorry about the URL, I posted the one which goes to the main page. The following should be correct:
It certainly doesn’t look like an easy one to use but I found the following basic code created a blank message in the Mailbox:
Call GroupWise.Account.MailBox.Messages.AddExistingMessage(“Joe”, “email@example.com”, “”, Date, 1, 0, 2, 0)
You’ll note that it is not a personal message and cannot be edited via the client. There are some other parameters which need to be used to point it to the content of an existing message structure, which I believe would fill in the other fields.