Hotmail showed other people's inboxes.
Microsoft said that it is investigating a security snafu at its Hotmail property that occurred earlier this week. Some Hotmail users report that, upon logging into their account, they would see the inbox that belonged to someone else.
Microsoft quickly issued a statement: "Microsoft is investigating reports of a limited number of instances in which Windows Live customers may have access to other customers' accounts when accessing their account through mobile web browser. Microsoft takes customers' privacy seriously, and immediately upon learning of these reports, we started an investigation."
The company hasn't yet revealed what, if anything, it has discovered yet, but pledged to take appropriate action once it has completed the investigation.