Disabling Messenger auto sign-in on the Xbox 360
Shortly after logging into Xbox Live the Xbox 360 will attempt to log into Windows Messenger, by default.
While I tried to find how to disable this, all of the articles I found were irrelevant, since they were written during the 'blades' interface.
Here's how I stumbled on it.
Press the Xbox button on your controller.
Go to the Settings tab.
Select Auto Sign-In.
Select Disabled under Windows Messenger.
For some reason I had to do this a couple of times for it to stick.
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