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Microsoft's free email service Hotmail is currently suffering from a bug that logs off users and prevents them from logging into the service again. Currently, this behavior is affecting only a fraction of the userbase, but the bug has not been fixed yet.
Microsoft spokeswoman Samantha McManus said the following in a statement: "The issue is purely impacting the login process for customers and largely does not impact customers who were already logged in. We have made significant progress in decreasing the number of customers currently affected since initial reports, but the issue has not yet been completely resolved."