Microsoft will launch a public beta of its anti-malware service, Microsoft Security Essentials, on Tuesday as it phases out its Live OneCare suite in favour of a simpler, free consumer security offering.
Microsoft Security Essentials, which will run on Windows XP, Vista and Windows 7, will be available in the US, Brazil, and Israel in English and Brazilian Portuguese. A public beta version for Simplified Chinese will be available later in the year.
The service works like traditional antivirus products in which client software monitors programs on a PC. When something changes on the computer, such as files being downloaded or copied, or software trying to modify files, the system checks against a set of malware signatures in the client program to see if the code matches the signature for known malware. If so, it blocks it from getting downloaded.
If no signature match is found, the system will ping the server-based Dynamic Signature Service to see if any new signatures are available and, if so, it removes the malware. If it appears to be new malware, the Dynamic Signature Service may request a sample of the code in order to create a new signature.
The service updates its anti-malware database constantly and publishes new antivirus signatures to Microsoft Update three times a day, Alan Packer, general manager of Microsoft's Anti-Malware team, said in an interview on Thursday.
"The hope is that people who install Security Essentials and enable auto updates in their Windows configuration will be protected [automatically]", he said.
The service also includes new technologies that help protect against rootkits, programs that are designed to hide the fact that a PC has been compromised, and is also designed to run efficiently by scanning when the PC is idle and conserving on memory usage.
Security Essentials does not detect if a user already has security software installed, but does provide a message upon install that says two antivirus products are unnecessary and could interfere with each other, Packer said.
Microsoft announced in November that it was dropping its Live OneCare service in favour of a slimmed-down free offering designed to encourage more people, particularly those who do not want to pay for it and fear it will slow down their computer, to use antivirus software.
The new service lacks features such as managed firewalls, performance-tuning, backup and restore, printer-sharing and multi-PC management that the OneCare service offered.
A spokeswoman for AVG, likely to be the main rival to Microsoft's service, said AVG offers a free internet security suite that has advantages because it is operating-system agnostic and was developed by a company that specialises in security products.
Asked what Microsoft's strategy is for mobile, Packer said he could not comment on what the Windows Mobile team is doing.
"In general, the way we look at mobile from a security standpoint is that you are better off preventing the malware from getting on a mobile device rather than trying to run anti-malware or antivirus software," he said. "We haven't targeted mobile antivirus software because we felt that's not the right approach."
Microsoft Security Essentials will be available for download from Microsoft beginning on Tuesday.
