The program, dubbed "trusted source," has seen more than 6,000 false positives fixed so far, just one week after the program started.
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While Microsoft will continue to provide updates to the antivirus engine and signatures for an extra year, you will no longer be able to download the program for a new installation.
If you continue to use Windows XP after it goes end-of-life next April you won't just be without security patches. You'll be without signature updates for your Microsoft Security Essentials antivirus.
Microsoft took a previous failure to win certification on the chin, but this time it says all antivirus tests struggle with reality.
Microsoft's upcoming Patch Tuesday security update will fix five critical holes that could lead to remote code execution, including in the recently released Windows 8 operating system.
The company has fixed updates to its Forefront and Security Essentials security software that falsely identified Google's home page as serving the Blackhole exploit kit
Both Microsoft and Google have updated software after Microsoft security programs falsely identified the Chrome browser as a Zeus banking Trojan
Is building an antivirus package into Windows a bad idea?
Disallowing admin rights of employees' endpoint devices not realistic solution to preventing malware threats in today's self-service IT business climate, observers say.
In the malware arms race that has seen digital villains stay one step ahead of the good guys, some landmarks stand out. ZDNet UK picks the most important, and most unexpected, unpleasant surprises to confront IT users
Microsoft needs to launch a new brand to handle its security products successfully according to co-founder and CEO of Kaspersky Labs, Eugene Kaspersky.
The Australian Communications and Media Authority (ACMA) has announced that it is ramping up its fight against telemarketers who try to convince customers that their computers are infected by viruses and then charge a fee for removal.
Almost a quarter of the UK population has been cold-called by scammers trying to sell fake antivirus software, according to safety campaign organisation Get Safe Online
How effective is free antivirus software? I had a chance to see a real, in-the-wild example just this month, and the results were, to put it mildly, unexpected. Microsoft's free antivirus solution found and removed a threat that two well-known paid products missed.
You want a good, solid, free antivirus program? Microsoft Security Essentials fills the bill nicely. Until recently, you had to download and install this software manually. Beginning this week, it's rolling out to all Windows users in the U.S. via Microsoft Update. So how long till antitrust lawyers begin squawking?
This is incredible. As if Windows weren't security-challenged and virus-ridden enough already...
The Carberp Trojan, which targets the most popular web browsers and operating systems, has the potential to rival the Zeus threat, according to web security firm TrustDefender
A Microsoft executive has advocated a plan for collective online security based on the public-health model, including the option of barring infected computers from the internet
The Stuxnet malware has infected thousands of computers inside Iran, with officials calling the situation 'electronic war' against the country
When hackers crash their systems while developing viruses, the code is often sent directly to Microsoft, according to one of its senior security architects, Rocky Heckman.