Good advice. I would suggest that the OP also encourage users running IE6 to upgrade.
You might want to take a look at the IE6 Update code (http://ie6update.com/) for ideas.
You might want to take a look at the IE6 Update code (http://ie6update.com/) for ideas.
My advice: support IE6 entirely, launch, iterate, then once you have users (= market) then make the choice to scale back IE6 development.
As a young startup you'll have plenty of reasons why users won't stick - don't make browser support (eg, something you can fix and are aware of) another reason.