Hi,

I have been looking throughout the web trying to find a document that states
what button types can be created for Outlook Plug-ins and have not found
anything official that positively states the allowed button types for a
plug-in. I would like to create a button type of "msoControlSplitButtonPopup"
but this appears as though it is not possible. Does anybody know a way to
create a button like the "new" or Send/Receive"  button?

Thanks