I am new to outlook add-in programming and am having a variety of problems.
Today it's existing attachments. I am trapping the Send event and trying to
process attachments on the message item. In this case a message with
attachments is being forwarded. I find that:
1) if I change the message body property, the attachments are deleted. If I
change the bodyhtml property, the attachments remain.

2) if I add a new attachment, the existing attachments are deleted.

I expected the existing attachments to be retained when I add a new one and
did not expect changing the body property to affect the attachments.

Any help or pointers to documentation discussing these issues would be
appreciated!