Three of the four critical fixes, which correct holes that could be remotely exploited, impact a particular component on Windows. One affects Outlook Express and Windows Mail, another impacts Internet Explorer and a third affects Office.
The fourth critical patch affects Windows.
Redmond also plans three "important" patches to sew up two holes in Windows and Office.
Last month, Microsoft delivered four fixes, one of its lighter Patch Tuesdays in recent months.
Microsoft next week also plans to release three, non-security updates for Microsoft Update and Windows Server Update Services and one, non-security updates for Windows Update.