You may have mis-interpreted the fact that because 1.6% of your users have IE, that means that you're in a space where those customers won't use IE.
What it may mean is that you don't have very many customers. If you were mainstream, you'd have more IE users... just like the rest of the Internet.
It's okay not to be mainstream... but, if time tracking is a competitive and profitable space, your competitors may be happy to share this blog post with their prospective users.
I think it's more critical than just having less IE users in that space... The thing is, 1.6% of total traffic does not equal 1.6% browser usage.
If all your IE visitors are seeing is a landing page and a message saying "sorry, we're too lazy to support for your browser", then of course they'll turn around and never come back. If they were to let IE users through, that number would most likely jump up - significantly.
I know a couple of hardcore IT guys and programmers that are really happy with IE9, and hate Firefox and Chrome with a passion. It happens!
What it may mean is that you don't have very many customers. If you were mainstream, you'd have more IE users... just like the rest of the Internet.
It's okay not to be mainstream... but, if time tracking is a competitive and profitable space, your competitors may be happy to share this blog post with their prospective users.