Skip to main content

Making use of Autodiscovery in VBS and Powershell Scripts

Auto discovery is one of the new features that are trying to alleviate some of the pain of configuring and maintaining Outlook client setting. Once you have managed to overcome the SSL configuration peculiarities you have a nifty little service that you can authenticate against, supply it with your email address and it will inform you about everything you need to know about connecting to exchange using Outlook, OWA, EWS and or any of the other new services Exchange 2007 provides. If you’re a scripter the information the auto discovery service provides can be retrieved via Active Directory but it not that easy and certain not as convenient as doing with one request.

The scripts I’ll talk about in this post are designed to be run from workstation where the Exchange Management Tools aren’t install so they won’t be using any of the Exchange Management Shell cmdlets.

The first thing you need to do if you want to use Auto discovery is query Active Directory for the Service Connection Point. This will give you the URL which you can send your AutoDiscovery Query (okay there is another option which is using The SCP for Autodiscovery is located under the server/procotol nodes in the Active directory configuration partition. So to start with you need to use an ADSI query with the following filter (&(objectClass=serviceConnectionPoint) (|(keywords=67661d7F-8FC4-4fa7-BFAC-E1D7794C1F68) (keywords=77378F46-2C66-4aa9-A6A6-3E7A48B19596))). This will return one or more SCP you can then use to make a auto discovery request. If you want to find the closest SCP to the machine that is making the query you can use the Keywords attribute on the ServiceConnectionPoint to return the site name. You could also use a IP table with some metrics to work this out. Once you have the URL for auto discovery you can then send a XML request to the autodiscover service. Of course you will to also authenticate for this to work in a script you can do this in one of two way by hardcoding a username and password into the script file or by using the logged on user credentials the script from the post both make use of the Logged on user credentials.

Thats pretty much it for more information on Auto discovery I would recommend having a read of this if you want to write something in C# that uses autodiscover then check out the Auto discover sample in the Exchange SDK.

I’ve put a download of the scripts here the vbs sample looks like

ScpUrlGuidString = "77378F46-2C66-4aa9-A6A6-3E7A48B19596"
ScpPtrGuidString = "67661d7F-8FC4-4fa7-BFAC-E1D7794C1F68"

set conn = createobject("ADODB.Connection")
set com = createobject("ADODB.Command")
Set iAdRootDSE = GetObject("LDAP://RootDSE")
strNameingContext = iAdRootDSE.Get("configurationNamingContext")
Conn.Provider = "ADsDSOObject"
Conn.Open "ADs Provider"
svcQuery = "<LDAP://CN=Microsoft Exchange,CN=Services," & strNameingContext &
">;(&(objectClass=serviceConnectionPoint)" _
& "(|(keywords=" & ScpPtrGuidString & ")(keywords=" & ScpUrlGuidString & ")));cn,name,serviceBindingInformation,legacyExchangeDN;subtree"
Com.ActiveConnection = Conn
Com.CommandText = svcQuery
Set Rs = Com.Execute
while not rs.eof
wscript.echo rs.fields("cn")
call queryautodiscovery(wscript.arguments(0),rs.fields("serviceBindingInformation").Value)

sub queryautodiscovery(emailaddress,casAddress)
wscript.echo "Using AutoDisover Address : " & casAddress(0)
autodiscoResponse = "<Autodiscover xmlns="""">"
& " <Request>" _
& " <EMailAddress>" + emailaddress + "</EMailAddress>" _
& " <AcceptableResponseSchema></AcceptableResponseSchema>"
& " </Request>" _
& "</Autodiscover>"
set req = createobject("MSXML2.ServerXMLHTTP.6.0")
req.Open "Post",casAddress(0) ,False
req.SetOption 2, 13056
req.setRequestHeader "Content-Type", "text/xml"
req.setRequestHeader "Content-Length", len(autodiscoResponse)
req.send autodiscoResponse
wscript.echo req.responsetext
end sub

Popular posts from this blog

Downloading a shared file from Onedrive for business using Powershell

I thought I'd quickly share this script I came up with to download a file that was shared using One Drive for Business (which is SharePoint under the covers) with Powershell. The following script takes a OneDrive for business URL which would look like This script is pretty simple it uses the SharePoint CSOM (Client side object Model) which it loads in the first line. It uses the URI object to separate the host and relative URL which the CSOM requires and also the SharePointOnlineCredentials object to handle the Office365 SharePoint online authentication. The following script is a function that take the OneDrive URL, Credentials for Office365 and path you want to download the file to and downloads the file. eg to run the script you would use something like ./spdownload.ps1 '

A walk-though using the Graph API Mailbox reports in Powershell

Quite recently the Reporting side of the Graph API has moved in GA from beta, there are quite a number of reports that can be run across various Office365 surfaces but in this post I'm going to focus on the Mailbox related ones. Accessing Office365 Reports using Powershell is nothing new and has been available in the previous reporting endpoint however from the end of January many of these cmdlets are now being depreciated in favour of the Graph API . Prerequisites  In comparison to using the Remote PowerShell cmdlets where only the correct Office365 Admin permissions where needed, to use the new Graph API reports endpoint you need to use OAuth for authentication so this requires an Application Registration  that is then given the correct oAuth Grants to use the Reports EndPoin

How to test SMTP using Opportunistic TLS with Powershell and grab the public certificate a SMTP server is using

Most email services these day employ Opportunistic TLS when trying to send Messages which means that wherever possible the Messages will be encrypted rather then the plain text legacy of SMTP.  This method was defined in RFC 3207 "SMTP Service Extension for Secure SMTP over Transport Layer Security" and  there's a quite a good explanation of Opportunistic TLS on Wikipedia .  This is used for both Server to Server (eg MTA to MTA) and Client to server (Eg a Message client like Outlook which acts as a MSA) the later being generally Authenticated. Basically it allows you to have a normal plain text SMTP conversation that is then upgraded to TLS using the STARTTLS verb. Not all servers will support this verb so if its not supported then a message is just sent as Plain text. TLS relies on PKI certificates and the administrative issue s that come around certificate management like expired certificates which is why I wrote th
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.