Skip to main content

WebService to Find Room and Equipment Mailboxes in Exchange 2007

In Exchange 2007 one of the new features is resource mailboxes out of the box you have two types of these mailboxes Room mailbox and Equipment mailbox. I’m rewriting some Intranet Meeting availability pages at the moment to work with Exchange Web Services and one thing you can’t do in EWS is run a query to find all these type of objects in your Exchange Organization. There are also a bunch of new features such as being able to set the resource capacity (eg how many people a room can hold) and custom resource properties (eg what type of things are in the room such as a whiteboard, projector etc). As this information is all stored in Active Directory you need to use LDAP to query this information. Because this is the type of thing I might want to use in multiple applications I thought I’d put together a little WebService that I could consume that would query this information on behalf of the requesting application and return information about the resource mailboxes firstly their email address's so i could then use this in a GetUserAvailability EWS operation and also where they are located and the extra resource capacity and resource custom properties.

The code to do this is pretty simple it’s just your standard System.DirectoryServices searching code the Ldap filter I used was to filter on the msExchRecipientDisplayType property which seems to get set to 7 for a Room Mailbox and 8 for a Equipment Mailbox. The WebService needs the rights to make these queries into the directory which you will need to solve with Impersonation and Delegation on your server. Alternatively you can hard code the alternate credential in your code (or web.config file) this is what I’m actually doing so If left that code in and just commend it out.

You can have a bit more fun with this if you expand your code eg you can use one of the Exchange custom attributes to store the Ip ranges of the local Ip subnets that are in close proximity to the Meeting Room's physical location. And then grab the IP of the client at the Intranet and use this information to return the meeting rooms close to where the client is making the request from (this depends a lot on your local setup).

I’ve put a downloadable copy of the Webserivce code here the code itself looks like.

using System;
using System.Web;
using System.Web.Services;
using System.Xml;
using System.Web.Services.Protocols;
using System.DirectoryServices;
using System.IO;

[WebService(Namespace = "")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
public class Service : System.Web.Services.WebService
public Service () {

public XmlDocument FindRooms() {
return FindMailboxes(7);
public XmlDocument FindEquipment()
return FindMailboxes(8);

private XmlDocument FindMailboxes(int MailboxType) {
string sqSearchQuery = "";
string mtMailboxType = "";
case 7:
sqSearchQuery = "(&(&(&(mailNickname=*)(objectcategory=person)(objectclass=user)(msExchRecipientDisplayType=7))))";
mtMailboxType = "Room Mailbox";
case 8:
sqSearchQuery = "(&(&(&(mailNickname=*)(objectcategory=person)(objectclass=user)(msExchRecipientDisplayType=8))))";
mtMailboxType = "Equipment";
XmlDocument rdReturnResult = new XmlDocument();
StringWriter xsXmlString = new StringWriter();
XmlWriter xrXmlWritter = new XmlTextWriter(xsXmlString);
xrXmlWritter.WriteAttributeString("type", mtMailboxType);
SearchResultCollection srSearchResults;
string roRootDSE = dsDirectorySearcher.SearchRoot.Path;
//string roRootDSE = "LDAP://dcName/DC=e2007dev,DC=domain,DC=com,DC=au";
//DirectoryEntry deDirectoryEntry = new DirectoryEntry(roRootDSE,
@"e2007dev\username", "password");
DirectoryEntry deDirectoryEntry = new DirectoryEntry(roRootDSE);
DirectorySearcher dsDirectorySearcher = new DirectorySearcher(deDirectoryEntry);
dsDirectorySearcher.SearchScope = SearchScope.Subtree;
dsDirectorySearcher.Filter = sqSearchQuery;
srSearchResults = dsDirectorySearcher.FindAll();
foreach (SearchResult srSearchResult in srSearchResults)
WriteAttributeValue(xrXmlWritter, srSearchResult, "msExchResourceCapacity");
WriteAttributeValue(xrXmlWritter, srSearchResult, "msExchResourceDisplay");
WriteAttributeValue(xrXmlWritter, srSearchResult, "displayName");
WriteAttributeValue(xrXmlWritter, srSearchResult, "co");
WriteAttributeValue(xrXmlWritter, srSearchResult, "department");
WriteAttributeValue(xrXmlWritter, srSearchResult, "physicalDeliveryOfficeName");
WriteAttributeValue(xrXmlWritter, srSearchResult, "postalCode");
WriteAttributeValue(xrXmlWritter, srSearchResult, "postOfficeBox");
WriteAttributeValue(xrXmlWritter, srSearchResult, "st");
WriteAttributeValue(xrXmlWritter, srSearchResult, "streetAddress");
WriteAttributeValue(xrXmlWritter, srSearchResult, "telephoneNumber");
return rdReturnResult;
private void WriteAttributeValue(XmlWriter xrXmlWritter, SearchResult
srSearchResult, String atAttribute)
if (srSearchResult.Properties.Contains(atAttribute))

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.