Delegating an existing task - no properties transferred

I am new to the Organizer so maybe I am misunderstanding the Getting Started Guide.

I have an existing task I want to delegate.  I press the delegate button which opens a new email.  The guide says the new e-message includes the task properties but I cannot see any task details.  The email contains a subject line but there are no start date, end date, estimated work.

The only way I seem to be able to "send" these details to the delegatee is via the standard Outlook Assign Task button.

Am I doing something wrong, do I have to Assign Task then Delegate in which case there are two steps and the delegatee will get two emails.

Thanks

Steven