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Editorial Team
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Asked: 2026-06-01T18:49:17+00:00

Trying to connect to exchange 2010 SP1 using EWS & VB.Net. When i try

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Trying to connect to exchange 2010 SP1 using EWS & VB.Net. When i try to use autodiscovery it works just fine. The problem being is it connects to my local exchange mailbox and thats not what i need. We have a mailbox that the exchange admins set up that all the programmers can connect to (call it TestMailbox). So when i do:

exchange.AutoDiscoverUrl("TestMailbox@MyDomain.com")

It connects to my local mailbox rather than the “TestMailbox”. I got the password for the TestMailbox NT account from our admin and tried all of the following: 

exchange.Credentials = New WebCredentials("TestMailbox@MyDomain.com", "Password")      


exchange.Credentials = New WebCredentials("TestMailbox", "Password") 

exchange.Credentials = New WebCredentials("TestMailbox", "Password","MyDomain")

exchange.Credentials = New WebCredentials("MyDomain\TestMailbox", "Password")

all of them fail. Say my NT username on my local net work is “User” i even tried:

exchange.Credentials = New WebCredentials("User@MyDomain.com", "MyPassword")

and it failed. I have been using the following Link for reference.

Edit 1: i have tried all the above with NetworkCredential rather than WebCredential and it still fails.

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  1. Editorial Team

    We figured it out. TheTestMailbox & ProdMailbox domain accounts were both setup to only allow certain computer to login locally.

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