Leave the IM application
When you exit the Instant messaging (IM) application, you remain signed in to IM
services. Your sessions remain active for a period of time, according to your service
subscription. When the IM application is running in the background, you can open other
applications, and return to using IM without signing in again.
Close the IM window
Go to the IM main view, and select
Sign out from IM
All conversations are closed.