Two more updates boost the total for tomorrow to seven, including patches for Internet Explorer and Windows XP.
This year's contest offers a grand prize of $150,000 that requires researchers to deal with Microsoft's EMET anti-exploit toolkit.
Three of the four updates for Windows on Patch Tuesday will affect Windows XP, which is scheduled for retirement in April.
As the countdown to Windows XP's cutoff continues, the company encourages users to help users to upgrade, but offers no discounts for the new OS.
The soon-to-be-retired Windows XP is gaining user share while adoption of Windows 8 and 8.1 stalls.
After last year's semi-washout, the March security contest will again try to draw out exploits of the Chrome operating system.
Microsoft's financial reports indicate it took a $39 million hit on its tablet sales during 2013's fourth quarter.
Two-thirds of "brand marketing messages" were opened in Q4 on a smartphone or tablet as another task flees the personal computer.
Intel will transition its McAfee division to become Intel Security in 2014, putting space between it and the erratic founder of the 27-year-old security firm.
OEMs asked for Dual OS devices, says Intel CEO, but will consumers want them?
Microsoft transmits a wealth of information from Windows PCs to its servers in the clear, claims a security researcher.
Windows 8 adoption increased in December to claim almost 12 percent of all Windows systems, while users finally start to abandon Windows XP, Net Applications reports.
Crashes are among the top complaint from users of iPad Air, Fire HDX, and iPad Mini.
Microsoft is urging patience for users awaiting an update that addresses tablet battery drain and use of the power-saving sleep mode.
Amazon, NPD Group trumpet sales of the bare-bones laptops in 2013 to consumers and businesses