"Releasing scheduled Adobe Flash updates any other time would force Microsoft to make their IE10 updates out-of-band, as they would want to maintain a close interval between Flash release and IE10 release," Kandek said.
If Microsoft was unwilling or unable to ship emergency updates for IE10, Windows 8 and Windows RT users would be vulnerable to quick-strike Flash exploits, potentially for weeks.
Adobe's Tuesday update patched seven vulnerabilities, all which could be used by hackers to hijack Windows PCs, Macs and machines running Linux. Engineers in Google's security team, as they often do, reported the seven to Adobe.
Microsoft updated IE10 on Windows 8 and Windows RT on Tuesday, making it the second time in a row that the company shipped patches the same day Adobe refreshed Flash.
Google, which has been bundling Flash with its Chrome browser for over two years, also updated its browser to include the patched version of the media player.
IE10 on Windows 7, which Microsoft has pledged to release as a preview by mid-November, will not include an integrated version of Flash, but will rely on the traditional plug-in. Still, it will, like other browsers, receive future updates on Patch Tuesday.
Adobe also said that it would, if necessary, issue emergency updates outside Microsoft's schedule to quash "zero-day" bugs.
Windows 8 and Windows RT users can obtain today's Flash update for IE10 via the Windows Update service, while others can either download the revised plug-in from Adobe's website or use the Flash updating tool.
Gregg Keizer covers Microsoft, security issues, Apple, Web browsers and general technology breaking news for Computerworld. Follow Gregg on Twitter at @gkeizer, or subscribe to Gregg's RSS feed . His e-mail address is email@example.com.
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