Exchange Web Services Managed API: Accessing other users items

Question

Is it possibly to access the folders and items of other Exchange accounts other than the one of the logged in user?

Can I do this via Exchange Web Services Managed API?

Answer 1

Yes it is possible, but you should know the password of the other user or grab in some ways this credentials ( NetworkCredential object). The typical first lines of you code could be

ExchangeService myService = new ExchangeService (ExchangeVersion.Exchange2007_SP1);
myService.Credentials = new NetworkCredential ("user@mycorp.local", "P@ssword00");

so you can access Exchange Server Web Services with the account which is other as the current user. See ExchangeService object description for more information.

If you are an admin you can make user impersonation by SMTP address .

Answer 2

Knowing the password is wrong and using impersonation (these days) is wrong.

Here's how you do it.

        ExchangeService _service = new ExchangeService(ExchangeVersion.Exchange2010_SP2);
        //CREDENTIALS OF AN ACCOUNT WHICH HAS READ ACCESS TO THE CALENDAR YOU NEED
        _service.Credentials = new WebCredentials(username, password);
        _service.Url = new Uri(serviceURL);

        SearchFilter.SearchFilterCollection searchFilter = new SearchFilter.SearchFilterCollection();
        searchFilter.Add(new SearchFilter.IsGreaterThanOrEqualTo(AppointmentSchema.Start, DateTime.Now.AddDays(-1)));
        searchFilter.Add(new SearchFilter.IsLessThanOrEqualTo(AppointmentSchema.Start, DateTime.Now.AddDays(2)));
        ItemView view = new ItemView(50);
        view.PropertySet = new PropertySet(BasePropertySet.IdOnly, AppointmentSchema.Subject, AppointmentSchema.Start, AppointmentSchema.AppointmentType, AppointmentSchema.End);

        //THIS NEXT LINE!!!
        var calendarSearch = new FolderId(WellKnownFolderName.Calendar, new Mailbox("email@ofsomemailbox.com"));
        var appointments = _service.FindItems(calendarSearch, searchFilter, view);

Answer 3

I suggest to use impersonation instead of login for each user. Via impersonation you can impersonate users. Its not the same like full access. Full access is on behave of, impersonation is act as.

A pre of impersonation is you have one username and password instead of having x usernames and passwords.

You can use impersonation like this way:

ExchangeService service = new ExchangeService(ExchangeVersion.Exchange2010);
service.Credentials = new NetworkCredential(appName, appPassword, emailDomain);
service.ImpersonatedUserId = new ImpersonatedUserId(ConnectingIdType.SmtpAddress, userToImpersonate);

when a user has delegate access to someone else, you can access the folder of the other user. For example: Person A will be impersonated and is able to access Person B