Accessing room calendar in EWS returns "No mailbox with such guid"

Question

I am trying to get the list of meetings from a room shared calendar using Microsoft Exchange (EWS) API and it's returning this error: No mailbox with such guid

var service = new ExchangeService();service.Credentials = new NetworkCredential("username", "password");service.Url = new Uri("exchangeUrl");var startDate = DateTime.Today;var endDate = DateTime.Today.AddDays(1);var cv = new CalendarView(startDate, endDate);var mailboxToAccess = "[email protected]";var calendarFolderId = new FolderId(WellKnownFolderName.Calendar, mailboxToAccess);var appointments = service.FindAppointments(calendarFolderId, cv); // << Exception happens here

Any ideas what could be wrong?

Best Answer

Use this, if you're trying to access Outlook mail box from an application end.
Language:C#

service.Credentials = new NetworkCredential("username", "password"); service.Url = new Uri("https://outlook.office365.com/EWS/Exchange.asmx");

Accepted Answer

Make sure that the user that you're using in

service.Credentials = new NetworkCredential("username", "password");

is a licensed user, with their own mailbox, that has been granted access to the Shared Mailbox in question.

Accessing room calendar in EWS returns "No mailbox with such guid"

Best Answer

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