<div>
By default traffic is encrypted between Outlook and Exchange. I am assume you have Exchange 2010 or above. You can check in user outlook account setting&gt;Security tab. Without enabling encryption, outlook won't connect. Certificate sits on your Exchange server. On your CAS role server. By default, you get self signed, then you get 3rd party and install. If you don't have cert, outlook user will see the warning. If you are not seeing anything, what i said above, your traffic is encrypted.
</div>


By default traffic is encrypted between Outlook and Exchange. I am assume you have Exchange 2010 or above. You can check in user outlook account setting>Security tab. Without enabling encryption, outlook won't connect. Certificate sits on your Exchange server. On your CAS role server. By default, you get self signed, then you get 3rd party and install. If you don't have cert, outlook user will see the warning. If you are not seeing anything, what i said above, your traffic is encrypted.

<div>
Couldn't find any possible way to get details from exchange server side.
</div>


Couldn't find any possible way to get details from exchange server side.

<div>
<div class="content wysiwyg-content">
Is there a possible way to find the number of users/mailbox using the digital certificate from outlook client for encryption purpose? It is Exchange on-premises solution. <br />
Any thoughts on that information fro server side?
</div>
</div>


Is there a possible way to find the number of users/mailbox using the digital certificate from outlook client for encryption purpose? It is Exchange on-premises solution. 
Any thoughts on that information fro server side?

Query finding users using digital certificate in Outlook

Encryption is the process of encoding messages or information in such a way that only authorized parties can read it. In an encryption scheme, the intended communication information or message, referred to as plaintext, is encrypted using an encryption algorithm, generating ciphertext that can only be read if decrypted. For technical reasons, an encryption scheme usually uses a pseudo-random encryption key generated by an algorithm. An authorized recipient can easily decrypt the message with the key provided by the originator to recipients, but not to unauthorized interceptors.

Encryption

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

Microsoft Outlook is a personal information manager from Microsoft, available as a part of the Microsoft Office suite. Although often used mainly as an email application, it also includes a calendar, task manager, contact manager, note-taker, journal, and web browser.