Outlook will block .library-ms and .search-ms attachments starting July 2025 to boost security across web and Windows apps.

Microsoft announced it will expand the list of blocked attachments in Outlook Web and the new Outlook for Windows starting ...

To improve security Microsoft Office prevents some previous versions of Microsoft Office file types should from being opened, without the help of Protected View in Trust Center. Microsoft Office ...

When you try to open an Office file that is blocked by your Registry policy settings, you may get the following error message You are attempting to save a file that ...

Malware can exploit your computer and your private information, but only if it manages to install itself. Microsoft Excel files -- and other formats that Microsoft Office applications generate ...

If you've ever tried sending an EXE or VBS file to someone, you know that -- like an overprotective mother -- Outlook prevents you from sending file types that it perceives to be dangerous in an ...

In total, Microsoft has now blocked 142 file extensions that it deems as at risk or that are typically sent as malicious attachments in emails. Microsoft is banning almost 40 new types of file ...

We also drill down into how file and object locking are implemented, and the differences between network file system (NFS), server message block (SMB) and common internet file system (CIFS ...