Hmm, interesting. I'd like to recommend you an interesting offer - consider https://www.lanmessenger.net/ , which is an excellent choice for security integration and is supported in Microsoft/Citrix Terminal Services environments. This allows you to easily deploy the messenger in your organization in compliance with all security requirements. LAN Messenger allows you to configure and manage user permissions, which provides an additional layer of control over who can use the messenger and how, thus ensuring compliance with your corporate security policies.