Making sure any online service doesn’t automatically log you in is critical if it’s possible that someone else might walk up and use your computer while you’re not looking.
The great news is that it’s trivially easy to do.
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While you’re in Outlook.com, click on your profile icon in the upper right and then click on Sign out.
That will sign you out and take you to the MSN home page.
Now, return to Outlook.com, and you’ll be required to sign back in.
That’s it. Just be sure to sign out, and it’ll require you to sign back in the next time. And it’ll prevent people from randomly walking up to your machine and using your account without needing to sign in at all.
More than Outlook.com
The question is about Outlook.com, but the concept applies to all online services.
If you have any concern at all that someone might walk up to your machine and start accessing your accounts, signing out will thwart them. Since they won’t be able to sign in as you, they’ll not be able to do a thing.
When in doubt, sign out.
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