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Mail Enabling a Public folder with the EWS Managed API and finding and changing the primary email address without using Exchange cmdlets

If your working with Public Folders in the EWS Managed API then you may want to mailenable a new or existing Public Folder without using EMS cmdlets. I described a method that you can use to mail enable Public folders using EWS a while ago here and this same method will work with a little bit of different code. Like the previous post you need to set the following 2 properties to mail enabled a folder.


So if you want to mailenable an existing folder that you have the path for say its "firstlevel/secondlevel/newfolder" you will first need to have some code that will find the folder based on the path by doing a search. Then once you have the folder ID you can Bind to the folder and set those Mapi properties. Using a UpdateFolder operation was one of the harder operations in normal EWS proxy code but its now so much easier to do in the EWS Managed API.

Once you have set these properties a backgroup process will create the AD Proxy object for this public folder which will contain all the email address's assigned to this and any other folder specific setting such a limits etc. If you want to connect to this proxy object and change things like limits and email address you can use LDAP directly without using the EMS cmdlets. A little word or warning if you are going to be setting email addresses directly you should make sure you implement code that ensures you dont create duplicate email addresses. To find the ADProxy object you can get the AD GUID of the proxy object by retrieving the following property via EWS and then use this GUID value to access the AD object.

PR_PF_PROXY = 0x671D

This is a binary property which will be returned base64 encoded so you first need to decode this and the convert it to hex to use in a System.DirectoryServices.

So the code to MailEnable a folder using the EWS Managed API looks like

String fpfolderPath = "";
ExtendedPropertyDefinition PR_PF_PROXY = new ExtendedPropertyDefinition(0x671D, MapiPropertyType.Binary);
PropertySet PsPropertySet = new PropertySet(PR_PF_PROXY);
PsPropertySet.BasePropertySet = BasePropertySet.FirstClassProperties;
Folder PfRoot = Folder.Bind(service, WellKnownFolderName.PublicFoldersRoot,PsPropertySet);
String[] faFldArray = fpfolderPath.Split('/');
Folder tfTargetFolder = PfRoot;
for (int lint = 1; lint < fview =" new" searchfilter =" new" propertyset =" PsPropertySet;" ffresult =" service.FindFolders(tfTargetFolder.Id," totalcount ="=" tftargetfolder =" ffResult.Folders[0];" pr_publish_in_address_book =" new" pr_pf_proxy_required =" new">

To access the AD proxy object using the FolderID from the prevous piece of code

ExtendedPropertyDefinition PR_PF_PROXY = new ExtendedPropertyDefinition(0x671D, MapiPropertyType.Binary);
PropertySet PsPropertySet = new PropertySet(PR_PF_PROXY);
Folder meMailEnabledFolder = Folder.Bind(service, tfTargetFolder.Id, PsPropertySet);
String pfProxy = "";
byte[] pfPro = Convert.FromBase64String(meMailEnabledFolder.ExtendedProperties[0].Value.ToString());
pfProxy = BitConverter.ToString(pfPro);
DirectoryEntry deDirEnt = new DirectoryEntry(("LDAP://<GUID=" + pfProxy.Replace("-", "") + ">"));
PropertyValueCollection proxyAddresses = deDirEnt.Properties["proxyAddresses"];
if (proxyAddresses != null)
for (int ipar = 0; ipar < proxyAddresses.Count; ipar++)
if (proxyAddresses[ipar].ToString().Contains("SMTP:"))
proxyAddresses[ipar] = "";

I've put a download of this code here

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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.