May I remind you that today being the second Tuesday of the month is Patch Tuesday. Later today, Microsoft will issue more patches. Several of the updates are rated critical, so patch your development PCs, patch your UAT, TEST, get client sign-off and then patch your live systems.
For more information see:
The last of these articles raises a very salutary point: "he referenced a vulnerability that was patched Jan. 10 by Microsoft, but was exploited roughly two weeks later"
The potential exploits that these patches protect against become actual exploits very quickly. I therefore urge you not to be complacent about applying security patches.