IBM has overhauled its list of worst security patchers among software vendors, putting Microsoft at the top of its list and shifting Sun from No. 1 to No. 5.Google, one of the companies that protested the methods used by IBM’s X-Force team to create the “Mid-Year Trend and Risk Report 2010,” dropped from No. 6 to No. 12.In explaining the changes, an IBM blogger says it's difficult to track all the vulnerability disclosures and patches because the data has to be gathered by hand. "As you might imagine, this is a complicated task, as every software vendor handles security vulnerabilities differently and few standards exist today for sharing this information," Tom Cross says in his blog.

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