avast! 4 Professional Edition is a complete ICSA certified antivirus package for your company. It obtained twice VB100% award in 2002 Virus Bulletin comparative reviews.

avast! scans for viruses, worms and Trojans: On Demand - with two User Interfaces, On Access, E-mail, during Boot Time, in File Explorer and Screen Saver. It maintains Virus Chest. True incremental updates based on iAVS technology updates twice a week virus definition file.

Download: avast! 4 Professional Edition 4.6.603

Change log:

• Added the new "Web Shield" resident provider for on-access scanning of HTTP traffic. Under NT-based systems, it should work automatically. On Win9x, you have to tell your browser to use HTTP proxy 127.0.0.1 on port 12080.
• Added NNTP (Usenet News) scanner to the Internet Mail provider. Under NT-based systems, it works transparently; under Win9x, the Mail Protection Wizard will help you set up the account (Outlook Express only).
• Added new unpacker for Outlook Express archives (.dbx files)
• Fixed crashing of the program when it found a boot/MBR virus
• The updater should now work with the default proxy settings even if IE is set to the "Work Offline" mode
• Avast now distinguishes between various malware categories and reports them differently.
• Greatly optimized memory footprint of the avast processes (especially ashServ.exe)
• Added support for long license keys (8-digit customer number)
• The Explorer Extension scanner should now work even under 64-bit Windows
• Under 64-bit Windows, the scan of the SYSTEM32 directory now works correctly
• Fixed the problem with very slow start of the avast on-access scanner service on certain Windows 2000 configurations with MS Outlook installed
• Fixed some problems in the GZIP unpacker
• Optimized CAB and CHM unpackers
• Fixed problems related with on-access scanning of named pipes (Windows NT/2000/XP Standard Shield)
• Hyperlinks in configuration property sheets now finally have correct background color
• Attempt to fix sound-related problems under Win9x
• Added links to certain FAQ entries on the Web
• Avast now correctly registers in the Windows Security Center under Windows 64-bit
• Fixed certain conflicts with copy-protected programs (AsProtect) under Win9x
• Warnings about suspicious e-mails (heuristics) are now displayed correctly even under terminal services environments (and while using the Fast User Switching feature in Windows XP)
• Added Romanian and Bulgarian language packs