How to list emails id of group or organization in exchange mail server using ews-java-api jar?

Question

our company has exchange server and there are few users.So i want to list all users in our company and read emails of all users email one by one.How can i do that?

ExchangeService service = new ExchangeService(ExchangeVersion.Exchange2010_SP1); // your server version
            ExchangeCredentials credentials = new WebCredentials("[email protected]", "password!"); // change them to your email username, password, email domain
            service.setCredentials(credentials);
            service.setUrl(new URI("domain/EWS/Exchange.asmx"));
            final int pageSize = 50;
            ItemView view = new ItemView(pageSize);
            FindItemsResults<Item> findResults;
             do {
             findResults = service.findItems(WellKnownFolderName.Inbox, view);
                for (Item item : findResults.getItems()) {
                    // reading emails
                }

                view.setOffset(view.getOffset() + pageSize);
            } while (findResults.isMoreAvailable());

With the above code i am able to get retrieve email of that particular account whose credentials i have provided in above code.But how can i list users emails id of company and retrieve emails of each user.Please help me with this. Thanks in advance.