Did you get a resolution for this? I have an employee with the same problem
but it is just in their regular Outlook mail.

"Omer Javed" wrote:

Hi,
I am working on an Outlook addin which facilitates the prcoess of creating
meetings and appointments. When I install this addin for the first time and
then Create and Update an appointment the "Send Update to Attendees" dialog
box doesn't show up, however if I restart Outlook client and then perform the
same changes to appointment it works fine. Please guide what can I do to make
it appear first time without restarting Outlook.

Thanks
Omer Javed
--
Great ideas often get violent response from mediocre minds. [Albert Einstien]