Wednesday, 21 June 2017 11:13

Microsoft admits disabling some AV software in Windows 10

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Microsoft has admitted that it disabled some third-party anti-virus software at the time of the Windows 10 Creators Update due to compatibility reasons, though it did not mention any vendor by name.

Two weeks ago, Kaspersky Lab filed anti-trust complaints against Microsoft with the European Commission and the German Federal Cartel Office, claiming that the Redmond-based software behemoth abuses its dominant position in the operating system market and unfairly competes in the anti-virus market.

The company's owner, Eugene Kaspersky said he was ready to prove "that Microsoft uses its dominant position in the computer operating system market to fiercely promote its own — inferior — security software (Windows Defender) at the expense of users’ previously self-chosen security solution. Such promotion is conducted using questionable methods, and we want to bring these methods to the attention of the anti-competition authorities."

Microsoft's admission came in a 1339-word blog post by Rob Lefferts, partner director, Windows and Devices Group, Security and Enterprise.

While Lefferts claimed in the post that Microsoft's own anti-virus program, Windows Defender, would only start operating on a Windows system when there is no other anti-virus software running, this does not seem to stack up with his assertion that some AV software was temporarily disabled for compatibility reasons.

Lefferts said because AV software could be deeply entwined within the operating system, "we doubled down on our efforts to help AV vendors be compatible with the latest updates".

He said that by the time the most recent Windows 10 Creators Update was released on 11 April, for example, "nearly all of the anti-virus applications that Microsoft tested were fully compatible. In fact, Microsoft’s application compatibility teams found that roughly 95% of Windows 10 PCs had an anti-virus application installed that was already compatible with Windows 10 Creators Update".

But for the 5% that were not compatible, Microsoft temporarily disabled some parts of the third-party AV software when the update began.

"For the small number of applications that still needed updating, we built a feature just for AV apps that would prompt the customer to install a new version of their AV app right after the update completed," Lefferts wrote.

"To do this, we first temporarily disabled some parts of the AV software when the update began. We did this work in partnership with the AV partner to specify which versions of their software are compatible and where to direct customers after updating."

Comment has been sought from Kaspersky Lab on this admission by Microsoft.


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Sam Varghese

Sam Varghese has been writing for iTWire since 2006, a year after the site came into existence. For nearly a decade thereafter, he wrote mostly about free and open source software, based on his own use of this genre of software. Since May 2016, he has been writing across many areas of technology. He has been a journalist for nearly 40 years in India (Indian Express and Deccan Herald), the UAE (Khaleej Times) and Australia (Daily Commercial News (now defunct) and The Age). His personal blog is titled Irregular Expression.

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