Instant messaging can pose various security risks in a corporate environment as it often allows the transmission and reception of files in real-time, which may not be adequately scanned for malware. Attackers may leverage this to send malicious files or links, potentially compromising systems or obtaining sensitive corporate information. Unlike traditional email, IM may not go through the same rigorous security checks, making it a more appealing vector for attackers. Additionally, conversations over IM can be intercepted if not properly encrypted, leading to information leaks. It is not a secure method for sharing sensitive data, nor does it inherently protect against anonymous communication, which is not a primary security risk.