Signed in on another computer or device
If you’re using older versions of Yahoo Messenger, it's possible to be signed out of any other devices when you sign in to Messenger on another computer or device.
Fixing the problem
You can remain signed in while accessing Messenger on multiple computers or devices, by upgrading to the latest version of Yahoo Messenger (which uses Multiple Points of Presence).
If you think someone has accessed your account without your permission, here’s how to immediately secure your account.
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