![]() ![]() Extensions used by the Java programming language: ".jar", ".jnlp".Extensions used for digital certificates: ".cer", ".crt", ".der". ![]() File extensions used by the Python scripting language: ".py", ".pyc", ".pyo", ".pyw", ".pyz", ".pyzw".Here's the new file extensions added to the BlockedFileTypes list: However, if your users are sending and receiving affected attachments, they will report that they are no longer able to download them." "The newly blocked file types are rarely used, so most organizations will not be affected by the change. "We're always evaluating ways to improve security for our customers, and so we took the time to audit the existing blocked file list and update it to better reflect the file types we see as risks today," Microsoft says in a blog post. Now, the expanded block list will also include 38 new extensions in an upcoming update, preventing Outlook on the Web users from downloading attachments that have any of these 142 file extensions, until or unless an Outlook or Microsoft Exchange Server administrator has whitelisted any of them on purpose by removing it from the BlockedFileTypes list. ![]()
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March 2023
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