I would use a tool like Process Explorer to locate information about a particular window. To interrogate it, you might need to use the StartMethod of MonitorAll depending on how it is started. I do not have this particular window myself, so I can't really be of specific assistance. If you do need specific help with Process Explorer, send a screen shot of the process explorer window with the process highlighted and I can give you some ideas for how to setup your adapter.
When using MonitorAll, you must make sure that interrogation is started before the application is executed. If that dialog is indeed from Outlook, and if you have started Outlook after starting interrogation, then I am afraid you'll need some hands-on assistance.