Skip to main content

Vb.NET sample for getting the number of Unread messages from an inbox using Impersonation with Exchange Web Services

Although im not a great user of VB any more there does seem to be a bit of a dirth of samples for those people who haven't made the leap to using C#. So here's something that might fill the void for a few people I've put a donwload of this code here the code itself looks like

Imports ewsvbsamp.ews
Imports System.Net
Imports System.Net.Security
Imports System.Security.Cryptography.X509Certificates
Module Module1

Sub Main()
Console.WriteLine(GetUnreadEmailCount("user@domain.com"))
End Sub
Public Function GetUnreadEmailCount(ByVal emailaddress As String) As Integer
Dim UnreadCount As Integer = 0
ServicePointManager.ServerCertificateValidationCallback = New RemoteCertificateValidationCallback(AddressOf ValidateCertificate)
Dim esb As New ExchangeServiceBinding
esb.RequestServerVersionValue = New RequestServerVersion
esb.RequestServerVersionValue.Version = ExchangeVersionType.Exchange2007_SP1
esb.Credentials = New NetworkCredential("user", "password", "domain")
esb.Url = "https://servername/EWS/Exchange.asmx"

Dim csConSid As New ConnectingSIDType
csConSid.PrimarySmtpAddress = emailaddress
Dim exImpersonate As New ExchangeImpersonationType
exImpersonate.ConnectingSID = csConSid
esb.ExchangeImpersonation = exImpersonate

Dim biArray(1) As BaseFolderIdType
Dim dfFolder As New DistinguishedFolderIdType
dfFolder.Id = DistinguishedFolderIdNameType.inbox
biArray(0) = dfFolder
Dim geGetFolder As New GetFolderType
geGetFolder.FolderIds = biArray
geGetFolder.FolderShape = New FolderResponseShapeType
geGetFolder.FolderShape.BaseShape = DefaultShapeNamesType.AllProperties
Dim gfResponse As GetFolderResponseType = esb.GetFolder(geGetFolder)
Dim rmta As ResponseMessageType() = gfResponse.ResponseMessages.Items
Dim rmt As FolderInfoResponseMessageType = DirectCast(rmta(0), FolderInfoResponseMessageType)
If rmt.ResponseClass = ResponseClassType.Success Then
Dim folder As FolderType = DirectCast(rmt.Folders(0), FolderType)
UnreadCount = folder.UnreadCount
End If
Return UnreadCount
End Function

Private Function ValidateCertificate(ByVal sender As Object, ByVal certificate As X509Certificate, ByVal chain As X509Chain, ByVal sslPolicyErrors As SslPolicyErrors) As Boolean
'Return True to force the certificate to be accepted.
Return True
End Function
End Module
Labels:

Popular posts from this blog

The MailboxConcurrency limit and using Batching in the Microsoft Graph API

If your getting an error such as Application is over its MailboxConcurrency limit while using the Microsoft Graph API this post may help you understand why. Background   The Mailbox  concurrency limit when your using the Graph API is 4 as per https://docs.microsoft.com/en-us/graph/throttling#outlook-service-limits . This is evaluated for each app ID and mailbox combination so this means you can have different apps running under the same credentials and the poor behavior of one won't cause the other to be throttled. If you compared that to EWS you could have up to 27 concurrent connections but they are shared across all apps on a first come first served basis. Batching Batching in the Graph API is a way of combining multiple requests into a single HTTP request. Batching in the Exchange Mail API's EWS and MAPI has been around for a long time and its common, for email Apps to process large numbers of smaller items for a variety of reasons.  Batching in the Gr...
Read more

Exporting and Uploading Mailbox Items using Exchange Web Services using the new ExportItems and UploadItems operations in Exchange 2010 SP1

Two new EWS Operations ExportItems and UploadItems where introduced in Exchange 2010 SP1 that allowed you to do a number of useful things that where previously not possible using Exchange Web Services. Any object that Exchange stores is basically a collection of properties for example a message object is a collection of Message properties, Recipient properties and Attachment properties with a few meta properties that describe the underlying storage thrown in. Normally when using EWS you can access these properties in a number of a ways eg one example is using the strongly type objects such as emailmessage that presents the underlying properties in an intuitive way that's easy to use. Another way is using Extended Properties to access the underlying properties directly. However previously in EWS there was no method to access every property of a message hence there is no way to export or import an item and maintain full fidelity of every property on that item (you could export the...
Read more

Sending a Message in Exchange Online via REST from an Arduino MKR1000

This is part 2 of my MKR1000 article, in this previous post  I looked at sending a Message via EWS using Basic Authentication.  In this Post I'll look at using the new Outlook REST API  which requires using OAuth authentication to get an Access Token. The prerequisites for this sketch are the same as in the other post with the addition of the ArduinoJson library  https://github.com/bblanchon/ArduinoJson  which is used to parse the Authentication Results to extract the Access Token. Also the SSL certificates for the login.windows.net  and outlook.office365.com need to be uploaded to the devices using the wifi101 Firmware updater. To use Token Authentication you need to register an Application in Azure https://msdn.microsoft.com/en-us/office/office365/howto/add-common-consent-manually  with the Mail.Send permission. The application should be a Native Client app that use the Out of Band Callback urn:ietf:wg:oauth:2.0:oob. You ...
Read more
All sample scripts and source code is provided by for illustrative purposes only. All examples are untested in different environments and therefore, I cannot guarantee or imply reliability, serviceability, or function of these programs.

All code contained herein is provided to you "AS IS" without any warranties of any kind. The implied warranties of non-infringement, merchantability and fitness for a particular purpose are expressly disclaimed.