[E2007] [EWSMA] [C#] [Windows]: How can I retrieve all mail sent via this Exchange server (during a time period)

Hi there,

I'm quite new to Exchange and I'm not sure how to do this.

I've been looking at both push and pull mechanisms. 

The query is conceptually simple. I can do it for one user, I think:

            var filter = new SearchFilter.IsGreaterThanOrEqualTo(ItemSchema.DateTimeSent, after);
            var folder = Folder.Bind(exchange, WellKnownFolderName.SentItems);

            var results = folder.FindItems(filter, new ItemView(1000));

....but I'm not sure how to it for all users.

Many thanks!