In 2009, Microsoft has released a total of 74 security updates that fixed the 190 holes in its operating systems and software. "A month patches was June, during which it was released 10 updates, 31 hole. The minimum number of security updates was released in January: 1 update that fixes 3 bugs. Apparently, after the holidays Microsoft is also very reluctant to work.

Total during 2009, Microsoft released 44 critical updates, with a high security rating, 27 critical updates, 3 "moderate" and not one update at a lower priority. As for bug fixes, some of the 190 entire 132 errors were marked as critical, 53 important and 5 moderately important. 55 update applies to the group Remote Code Execution (remote code execution), 5 Denial of Service (Denial of Service), 3 Spoofing (draw), 10 Elevation of Privileges (modified privileges) and 1 Information Disclosure (Disclosure). These 74 security updates, a total of 157 fixed bugs Remote Code Execution, 7 Denial of Service, 7 Spoofing, 18 Elevation of Privileges and 1 Information Disclosure.

The most insecure creation of this year's Microsoft operating system Windows Server 2003, which accounted for 34 patches. Windows Server 2008 and Windows XP had 30 patches at their heels followed by Windows Vista and Windows 2000: from 26 patches. Windows 7 so far received only 1 security update that fixes 3 bugs. This is quite natural if we remember that Windows 7 was represented by only a few weeks ago.

In the past year in Internet Explorer 6 was corrected 7 errors in IE5 and IE7 ─ to 6. In Internet Explorer 8 during 2009 were found and corrected only 4 errors. Among the most Microsoft Office packages "patched" in 2009, he received the Microsoft Office 2003: 13 errors. Second place Office XP with 11 errors at third Office 2007 with 10 errors. Microsoft Office 2000 was made the least amount of corrections, only 8 fixed bugs. In Office 2004 and Office 2008 for Mac in 2009 was corrected to 6 errors.