: Using unlicensed software is a violation of intellectual property laws and can result in heavy fines or legal action from GFI Software.
: Cracked software cannot be officially updated. This leaves your server permanently vulnerable to Zero-Day exploits and new security flaws that GFI Software (the developer) patches in legitimate versions.
(often cited in tech forums) frequently post modified versions or license keys for various Kerio builds, using these carries several dangers. Risks of Using Cracked Software Security Vulnerabilities