Microsoft's weak Windows encryption key deadline expires today

Microsoft first started warning people that the there was going to be an important change to Windows' certificate requirements back in June. A change that is designed to improve security across the Windows platform by way of increasing the RSA key length to a minimum of 1024 bits for certificates used in Public Key Infrastructure (PKI). That requirement change happens today, October 9th, but are you one of those people who, as Angela Gunn from Microsoft Security Response Center puts it, has "systems and applications that have been tucked away to collect dust and cobwebs because they 'still work' and have not had any cause for review for some time"?