Outlook has over 400 million active users around the world. This issue seems to be affecting both personal and work Outlook accounts, as well as Hotmail accounts. Hotmail is also owned by Microsoft. Some users are seeing a message saying that their license is not valid, while others are seeing a message that says, "Something went wrong."

Microsoft 365 and Outlook users are being targeted by a tactic that injects fake billing alerts directly into their calendars.

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