Has anyone tried "BugMeNot.com"?

[kandrathe]

Fourth point: Nope, no real proof of that especially when most professional companies are still rolling out IE distributions across the company infrastructure.  Makes sense that if you've got a network running Microsoft server application and communal documents written in Microsoft Office that you use Microsoft Internet Explorer to actually access everything.
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Sure, a large corporation might prefer distribute IE to the user base, but what does the IT staff use?

The OS configuration, firewall and security precautions put on the general "user" pool is usually such that would protect the network from most malicious garbage. If you give your user base access to the internet, you need to expect them to try to install crap that might harbor trojans and what not. You need to design the security of the network for the worst case scenario. In large organizations, the desktop is imaged, locked up pretty tight and managed with Distributed Management Interface tool (Radia, SMS, Openview).

So, assuming you have locked down the installation of potential trojans, next you need to assess which programs you are going to allow to be installed into your environment. Here is where the comparison of needs versus risks is made. If IE offers more functionality, but with increased risk then it might not be worth it.