Instant messaging, also known as chat, is integrated with electronic mail in a user interface that provides for conversion of messages between electronic mail (email) and instant messaging. A user interface is provided for allowing a user who is composing an email message to convert the message to a chat message. The chat message will include any content that was present in the electronic mail message, and the user can continue to compose the chat message, and then send it to a chat address determined automatically from the email address of the original email message. Notifications are provided that indicate when chat users have logged on to or logged off from the chat service. These notifications assist a user composing a message to select the most appropriate communication method based upon the current online presence of the intended recipient. A user interface for converting messages in the opposite direction, from chat to email, is also provided.