Microsoft Outlook and Microsoft 365 Servers Fail Worldwide; Over 100,000 Complaints Registered

The Outlook service is experiencing instability this Thursday, November 12th, which has complicated users' access to their email inboxes. Microsoft confirmed that it is conducting an investigation into connection issues in Exchange Online, a service integrated with Microsoft 365.

According to the company itself, the failure may be caused by an overload in parts of the infrastructure across various regions. Although the first reports of problems were noted in the Americas, there is a possibility that users in any other area may also be affected.

Microsoft is actively working to reduce the impact of this situation and provides updates in the Microsoft 365 admin center, using codes EX1550543 and MO1550821. Regarding initial reports, it was mentioned that the company was investigating access issues to Exchange Online mailboxes through multiple connection methods in the Americas.

On online service monitoring platforms, such as DownDetector, the registration of user complaints began to increase around 2:45 PM on the current day.

Clients of Caixa Vida and Previdência began receiving email notifications this Thursday, November 12, regarding an intrusion into the financial institution's systems. It is estimated that the registration data of at least 7.6 million individuals was compromised.

According to the sent communication, unauthorized access to Caixa's systems was detected on November 6, 2026. This invasion resulted in the collection of personal information, including name, CPF, date of birth, nationality, email address, and phone number.

Caixa itself assures that, as of now, there is no indication that this leaked data has been made public or used inappropriately. Despite this, the alert is considered relevant, given that such information can be used as a basis for fraud, such as fake phone calls simulating bank employees.

In a report about the incident, sent to the Securities and Exchange Commission (CVM), Caixa informed that the hacker action affected 7.6 million clients of Caixa Vida and Previdência, a division managed by Caixa Seguridade. This number includes both current and former clients.

Caixa Vida e Previdência offers various services, such as life insurance, private pension plans, travel insurance, and personal accident protection. Therefore, anyone who possesses or has had access to these products must be attentive to the risk of fraudulent contacts.

It is important to note that the intrusion did not compromise the data of clients of Caixa Econômica Federal as a bank, nor the data of other subsidiaries, such as Caixa Cartões or Caixa Loterias.

In compliance with current legislation, Caixa has already notified the National Data Protection Agency (ANPD) of the incident and stated that it has implemented measures to reduce undue access to its systems.

On Thursday afternoon, the 12th, Microsoft Outlook began to show operational problems. The failures range from the ability to log in to the platform to the processes of sending and viewing email messages.

The Downdetector platform, used to monitor the status of online services, registered a volume of complaints close to two thousand cases. Furthermore, complaints were noted about the situation on social media in various global regions.

On X, users worldwide reported difficulties with the service. Despite the issues identified by the public, Microsoft itself states on its status page that Outlook remains operational. To date, the company has not issued an official statement regarding the incident.