MSN (stylized as msn) is a web portal and related collection of Internet services and apps for Windows and mobile devices, provided by Microsoft and launched on August 24, 1995, the same release date as Windows 95.

Messenger Plus! (formerly known as Messenger Plus! Live, commonly abbreviated MsgPlus, Plus!, or incorrectly as MSN Plus) is an adware add-on for Windows Live Messenger and Skype. The software provides additional functionality to Microsoft's Instant messaging client, Windows Live Messenger, by adding its own controls to the main interface. These controls affect Messenger's behaviour and appearance, often through additional dialog boxes.