Minor nit
Being able to work in the browser bypasses any most issues
Because some versions of IE don't work properly with Google Apps and many of the offices I work with see the warning when they start IE. Yes, I tell them Firefox and Chrome alleviate the issue, but their accepted baselines don't necessarily include either of them. Yes, it's dumb, but I don't get to make the rules. In fact in most instances I don't even get to give feedback saying how dumb they are.