OneNote: Microsoft to Prohibit 120 Hazardous File Extensions – ET Telecom

Microsoft, the American multinational technology corporation, has recently announced plans to block over 120 dangerous file extensions in OneNote. With the increasing threat of cyber attacks and malware, Microsoft is taking proactive measures to enhance security and protect its users from potential cyber threats. This decision highlights the company’s commitment towards ensuring the safety of its users and their data. In this article, we will discuss the significance of Microsoft’s move and how it will impact the technology industry as a whole.


Microsoft is strengthening the security measures of its OneNote application to protect against phishing attacks. In an effort to stop ongoing phishing campaigns, it will block 120 high-risk file extensions once new security updates are rolled out. The update will be implemented in the Current Channel of OneNote for Microsoft 365 on Windows devices between late April and late May 2023. Microsoft plans to align blocked files from OneNote with those blocked in Outlook, Word, Excel and PowerPoint. Previously, users were warned about the risks of opening attachments, but still allowed to open embedded files labeled as dangerous. With the new security enhancements in place, users will no longer be able to open files with dangerous extensions. If a file is blocked, users will be shown a warning dialogue that reads, “Your administrator has blocked your ability to open this file type in OneNote”. In recent months, hackers have been distributing malware using OneNote attachments in phishing emails, infecting victims using remote access malware that can be used to install additional malware, steal passwords, or even cryptocurrency wallets. As a result, Microsoft has taken steps to protect its users from such attacks.


In conclusion, Microsoft’s decision to block 120 dangerous file extensions in OneNote is a significant step towards ensuring the safety of its users. This move establishes Microsoft’s commitment to cybersecurity and will undoubtedly help prevent cyber-attacks on individuals and organizations alike. As technology continues to evolve, it’s crucial for companies to stay ahead of potential threats and prioritize the safety of their users. With measures like this, Microsoft is setting a great example for the industry as a whole. We can only hope that other companies follow in their footsteps and prioritize cybersecurity in the future.