Threat identity

Threat identity (IDE) files: overview
Threat identity (IDE) files contain threat identities which allow Sophos Anti-Virus to detect and disinfect the latest malicious software and other threats.
All versions of Sophos Anti-Virus later than version 4.5 update with IDE files automatically.
IDE files are a supplement to regular engine and full threat updates, and not a replacement.
Sophos Anti-Virus IDE files are cross-platform. All operating system versions of Sophos Anti-Virus can use the same IDE files.
Where necessary, for example with emergency command lines scanners, and older versions of Sophos Anti-Virus (e.g. OpenVMS), you can download and add IDE files manually.
Related articles:
Using IDE files with command line emergency versions
Threat identity (IDE) files: how to use
Threat identity (IDE) files: obtaining
Finding information about threats
Daily Supplemental IDE files