The KB will also be included in the Monthly Rollup and the Security Only Update for Windows 8.1, Windows Server 2012, and Windows Embedded 8 Standard.
As of July 2021, the KB4577586 “Update for Removal of Adobe Flash Player” will be included in the Latest Cumulative Update for Windows 10, versions 1607 and Windows 10, version 1507. It will also be included in every subsequent Latest Cumulative Update. Starting in June 2021, the KB4577586 “Update for Removal of Adobe Flash Player” will be included in the Preview Update for Windows 10, version 1809 and above platforms. It is unclear how many Windows computers received KB4577586 in February, but in an update to its September 2020 blog post made last week, Microsoft now says the end goal is to deploy the update to most Windows systems by July 2021. Initially, the update package was offered as an optional download that system administrators could get from the Microsoft Update Catalog portal and deploy at their discretion.īut without any kind of formal announcement, Microsoft started silently and forcibly deploying the KB4577586 update to some Windows 10 computers in February 2021. In September 2020, the OS maker released the KB4577586 update packages that would remove all traces of the Flash Player app from Windows devices. Microsoft realized this would be an issue last year. While Microsoft and the other major web browsers removed the Flash Player plugin from their browsers’ source code, Flash Player code is still installed at the OS level. 
Today, Adobe does not release any kind of software updates for Flash Player, meaning the app is the equivalent of dead code sitting on Windows computers around the globe and is ripe for exploitation by hackers and malware operations.
The move comes after Adobe formally deprecated Flash Player, which reached its end-of-life (EOL) on December 31, 2020. Microsoft plans to eliminate a major security risk by removing all remnants of the old Adobe Flash Player app from Windows operating systems by July 2021, the company said last week. Microsoft will permanently remove Flash from Windows PCs by July 2021
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