Zone Labs Inc., a leading creator of endpoint security solutions, today announced the immediate availability of ZoneAlarm Pro 4.0, the newest version of the company's award-winning Internet security product. ZoneAlarm Pro 4.0 offers more powerful security features and improved privacy tools in an easy-to-use, customizable package that can be tailored to every user?s skill level from those desiring ?out of the box? protection to security experts needing very specific configurations. ZoneAlarm Pro 4.0 includes new, stronger Internet security measures including updated anti-hacker and anti-Spyware safeguards to combat the latest vulnerabilities and exploits. In addition to overall ?hardening? of security, ZoneAlarm Pro 4.0 extends its popular MailSafe feature to examine both outbound, as well as inbound, email for potentially harmful file attachments. This feature is particularly useful in stopping malicious email-borne ?worms? from proliferating. Intelligence data from MessageLabs, which tracks the global spread of email-borne threats, underscores the remarkable longevity and lightning-fast transmission speeds of these worms despite the availability of specific anti-virus updates. Klez and Yaha, for example, claim the dubious distinction of first and second place on the list of most active viruses of all time while Bugbear.B earns a spot on that same ?top 10? list even though it was only discovered in early June 2003. The new outbound MailSafe feature in ZoneAlarm Pro 4.0 can block the proliferation of these and other similar worms, thwarting their propagation and significantly shortening their lifespan. Another innovation designed to help keep the Internet safer is the new Hacker ID? feature, which gives members of the Zone Labs community the ability to track and report attacks on their PCs safely, thus making it more difficult for prolific hackers to ply their craft. Also new in ZoneAlarm Pro 4.0 is CacheCleaner which speeds overall PC performance while preventing invasions of privacy by cookie-snooping web sites.