Complex software will always have
vulnerabilities and motivated adversaries will always work to discover and take advantage of them. There is no evidence that upgrading away from the latest fully patched versions of Internet Explorer to other browsers will make users more secure.
It is not straightforward for
HMG departments to upgrade IE versions on their systems. Upgrading these systems to IE8 can be a very large operation, taking weeks to test and roll out to all users.
To test all the web
applications currently used by HMG departments can take months at signiﬁcant potential cost to the taxpayer. It is therefore more cost effective in many cases to continue to use IE6 and rely on other measures, such as ﬁrewalls and malware scanning software, to further protect public sector internet users.