Bopup Communication Server is an in-house instant messaging server for private IM, internal chat and secure collaboration over corporate and business networks. It provides Active Directory support and integration, message and file archiving, offline messaging and document distribution with a strong encryption of transmitted data. The server offers various authentication modes to accept user connections, manages user groups from a single place, supports and handles easy and very effective distribution of documents and important events from the IM server to employees and users. Since the communication server is designed for business and enterprise-level environments it is intended to install and organize a private and internal chat system and real-time communication platform for companies with no outside access too. Bopup Communication Server is easy and fast to set up which takes about few minutes to get completed. It comes with embedded SQL server to host it's database or can be installed using an existing SQL Server software. The communication server includes a built-in functionality to upgrade IM client software with uploading new versions of the messengers on the server. End-user messaging applications can be also distributed and deployed with pre-installed settings and options that reduces an overall time of software setup. And the IM client branding feature lets upload company's image, logotype on the communication server and show it in the messengers interface. It is highly important for companies and organizations that want to get their messaging software in an unique corporate style. In addition to Windows/Android IM clients the server also supports custom instant messengers and applications that are built using IM Client SDK (Software Development Kit) which provides components, libraries and programmer documentation. Bopup Communication Server is offered for FREE to companies and offices with a small amount of the IM client licenses.