Skip to main content

How to Like\Unlike an Item using EWS in Exchange Online

Likes and Mentions are a new feature in Exchange Online (in OWA) that was introduced late last year in First Release for Office365. With the focused Inbox now being rolled out to replace clutter these are some of the new social user curation type features that could change the user experience (hopefully for the better) in the coming years. While none of these features are new to those people using other Social platforms like facebook, twitter etc they do offer a world of new possibilities to those that have a little imagination.

In this post I'm going to look at how you can Like an item using Exchange Web Services eg

Currently there is no real documentation on the use of Likes in any API or how they are delivered in Exchange Online so care should be taken as this may mean the feature is subject to change in any of the future service updates.

Versioning your Requests

To use likes fully you need to make sure you version your EWS requests (which involves setting the ServerRequestVersion in the SOAP header) to V2015_10_05 or higher.  The Like information is returned by Exchange as a Strongly Type property in EWS (LikeType). If you look at a Response that includes the Like information in the SOAP response you should see both Like and LikePreview returned eg

      <t:Name>Glen Scales</t:Name>
    <t:Name>Glen Scales</t:Name>

If you have the latest proxy objects from the Exchange Online WSDL then you should see the Likes and LikePreview property collections in the ItemType Class. In the latest EWS Managed API from github only the Likes class is currently available.

Liking an Item (Unsupported)

The EWS LikeItem operation currently has no definition in the Services.WSDL so liking an Item via EWS is currently unsupported. However you can still use the operation as long as you construct the request using Raw SOAP message eg a request to like or unlike and item using EWS look like

<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:soap=""
    <t:RequestServerVersion Version="V2015_10_05"/>
  <soap:Body xmlns="">
      <ItemId Id="AAM.." ChangeKey="CQA.."/>

As this is an unsupported operation if you do something like try to like the same item twice you will get a 500 error rather then a nice SOAP based error response. I've put together a scrip that allows you to search for an Item via subject and like or unlike it using EWS. I've put this up on GitHub here

Popular posts from this blog

Using the MSAL (Microsoft Authentication Library) in EWS with Office365

Last July Microsoft announced here they would be disabling basic authentication in EWS on October 13 2020 which is now a little over a year away. Given the amount of time that has passed since the announcement any line of business applications or third party applications that you use that had been using Basic authentication should have been modified or upgraded to support using oAuth. If this isn't the case the time to take action is now. When you need to migrate a .NET app or script you have using EWS and basic Authentication you have two Authentication libraries you can choose from ADAL - Azure AD Authentication Library (uses the v1 Azure AD Endpoint) MSAL - Microsoft Authentication Library (uses the v2 Microsoft Identity Platform Endpoint) the most common library you will come across in use is the ADAL libraries because its been around the longest, has good support across a number of languages and allows complex authentications scenarios with support for SAML etc. The

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

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
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.