From InfoWorld’s Top 20 IT mistakes list:
11. Developing Web apps for IE only
Despite the fact that mission-critical applications continue their march onto the Web browser and that Windows continues to dominate the corporate desktop, Web developers should avoid the temptation to develop applications only for bug-ridden IE. IT shops that insist on using IE for Web applications should be prepared to deal with malicious code attacks such as JS.Scob.
First discovered in June 2004, JS.Scob was distributed via compromised IIS Web servers. The code itself quietly redirects customers of compromised sites to sites controlled by a Russian hacking group. There, unwitting IE users download a Trojan horse program that captures keystrokes and personal data. Although this might not sound like a threat to corporate IT, keep in mind that employees often use the same passwords across corporate and personal assets.
Many enterprises may not be able to avoid using IE. But if you make sure your key Web applications don’t depend on IE-only functionality, you’ll have an easier time switching to an alternative, such as Mozilla Firefox, if ongoing IE security holes become too burdensome and risky for your IT environment.
I’m upset they didn’t mention that failure to be compatible on your website will get you on my naughty list. Oh well.
The whole list is very good, I’d strongly recommend anyone interested in IT read the complete article.