Determining missing updates from command-line output
Here is a quick tip on how to quickly script MBSA 2.0 to filter and show only the missing updates. But before start using it, note that using a script to parse the <UpdateData> nodes is a far better idea because of the richness of the information it is there. Refer to other posts in my blog for samples on how to achieve that (for example, this one). Now the quick filter:
mbsacli /n password+os+iis+sql | findstr "|| Missing ||"
By using the /n switch, you will be disabling all other checks but security update compliance, so be careful when using such option. Also notice that the word "Missing" is localized (it changes depending on the language of MBSA you installed). The example above only works for English MBSA 2.0 installations. You need to update the term to other languages as appropriate.