Can't get appointments from Exchange for account without a mailbox

Question

I've got a small bit of code that connects to Exchange to get the appointments for a particular account. This account does not have a mailbox.

Dim service As New ExchangeService(ExchangeVersion.Exchange2010_SP2)
service.Credentials = New NetworkCredential("userID", "password")
service.AutodiscoverUrl("[email protected]")   

Dim calView As New CalendarView(DateTime.Today, DateTime.Today.AddYears(2))
calView.Traversal = ItemTraversal.Shallow
calView.PropertySet = New PropertySet(BasePropertySet.FirstClassProperties, ItemSchema.Subject, AppointmentSchema.Location)

Dim mtgs As FindItemsResults(Of Item) = service.FindItems(WellKnownFolderName.Calendar, calView)

The code raises the following exception on the last line.

When making a request as an account that does not have a mailbox, you must specify the mailbox primary SMTP address for any distinguished folder Ids.

I've run the code with service.UseDefaultCredentials = True in place of the Credentials line and it executes but brings back my appointments, of course. Is there a fix for this? I think my alternative is to convince the Exchange admins to grant my account Impersonate privileges for the account of interest.

Consider posting your answer, as an answer. It'll help out other users. — Idris

Bashzilla Bashzilla · Accepted Answer · 2014-04-12T21:43:29

I found my error. This account has rights to the schedules for some meeting rooms but doesn't have a mailbox (or calendar) of its own. Therefore the FindItems line should not use "WellKnowFolderName.Calendar", which would be the calendar of the account. Instead, it should use a new FolderID object that specifies the calendar folder for the meeting room being searched.

Dim _cal As New FolderId(WellKnownFolderName.Calendar, New Microsoft.Exchange.WebServices.Data.Mailbox(room))

Can't get appointments from Exchange for account without a mailbox

1 Answers