When I receive a meeting request (standard Outlook functionality) the message
closes automatically after I select either Accept, Decline etc.

I have created a custom form and added voting buttons to it but when the
recipient receives the message it remains open after they have selected a
voting option. The user has to manually close the message. The problem that
this presents is that some users cannot remember whether they have voted or
not when they re-read the message a later date.

What I would like to achieve is:

a) for the message to automatically close when the user selects a voting
option
b) to include some sort of indication on the message that states whether the
user has responded to the message

Is this possible?

Thanks