Modern instant messenger for secure text messaging and file transfer for office and corporate use. Bopup Messenger supports broadcast (group) and offline messaging, it perfectly works on domain networks with Active Directory authentication. The messenger encrypts all conversations and documents that are logged on a central IM server. On-premise messaging server also offers functions for management of user's settings and for IM client branding. The messenger has a classic interface with Contact List and opens separate dialog windows for each conversation. Text of outgoing messages can be styled with font and color, and by inserting links and graphic emotions. Since the application works within a central messaging server then messages can be sent even remote recipients are in offline. The server stores and delivers IM and documents once a remote user goes online. Since Bopup Messenger is built for office and corporate use then it can be used on Terminal Server and Citrix environment. This IM app also supports messaging over Internet so it is possible to unite employees from different branches and offices of a company into private and managed IM network. Users can also chat on mobile devices by using instant messenger for Android platform.