ZA uses the latest SDK engine from Kaspersky. This is basically equivalent to enterprise versions of Kaspersky currently on the market. Sometime its even ahead of enterprise versions in terms of fixes and core drivers. It just depends on when you look at it. So, definitively up to date and users saying otherwise they just simply says that enterprise version of KAV is junk as compared to latest KAV home versions. Not very good marketing for KAV and not objective assessment. See AV-TEST results. Of course, aside the signature engine, KAV and ZA are two completely different products with different features and options. Proactive protection is different with different modules (ZA OSFirewall, ZA Application control, etc). This has been discussed several times in here not the first time KAV supporters tries to discredit ZA. Its normal, no one is happy to see clones performing as well as the very latest and best tool There are users happy with KAV other happy with ZA. Just a matter of taste and preference on how better they run on the system. Please lets no enter into A vs B. otherwise this thread is dead.