Designers and developers have been saying it for years, and now even Microsoft are throwing their own stones:
We recommend that Internet Explorer 6 users upgrade to a newer version of Internet Explorer for a safer browsing experience.Microsoft
Of course they’re recommending that the upgrade be to Internet Explorer 9 – but there other options that I prefer available as well. I’ve been using the Firefox 4 Beta a lot lately, and loving it.
Find out more here: www.ie6countdown.com. There’s even some tips for migrating Corporate Users.