| Subject | English | Bulgarian |
| comp., MS | federated instant messaging | външни IM (Instant messaging with federated contacts) |
| comp., MS | instant messaging | синхронен разговор (Pertaining to a message sent in real time through a network to a private chat area) |
| comp., MS | instant messaging | метод за комуникация чрез незабавни съобщения (A method of real-time communication over the Internet in which a sender types a message to one or more recipients and the recipient immediately receives the message in a chat area) |
| comp., MS | instant messaging session | сесия от незабавни съобщения (A real-time communication over the Internet in which a sender types a message to one or more recipients and the recipient(s) immediately receives the message in a pop-up window) |
| comp., MS | internal instant messaging | вътрешни незабавни съобщения (Instant messaging with internal users) |