Inconsistent Outlook Message Dialogs

I wonder if you have noticed this in Outlook. If you try to send a mail without a recipient, it shows this dialog,

whereas, if you do the same thing with a meeting request, this dialog shows up.
I'd expect the same message dialog to show up, not only because it is consistent, but also efficient. No extra program management, developer and QA effort.

I see this more as problem with the Org structure in the Engineering team rather than oversight by the Program Manager. There probably had different Project Managers :)

p.s. click on the image for a clearer view.