Google are trying to keep existing users happy with the "try anyway" link. This is a new business, and they have decided they don't want to support IE.

At worst, this annoys die-hard IE users, but they're not your customers anyway.

The danger of adding a try anyway link is that people will click it, then still call and complain that your site doesn't work even if you place a huge disclaimer telling them IE is unsupported.

Finally, your website may do things that not only break in IE, but can cause your users to lose data when it does break. Yes, standard backups, never deleting data rules apply. But there is time spent either recovering, or explaining to users why you won't recover data for them.

* potentially lose work

* have a product that you paid for that doesn't do everything you want it to do

* get frustrated when things don't work and nobody will fix them ("Why don't you care?")

Bottom line - if you don't want to support Internet Explorer, I'd say feel free to detect it and then block it. Preferrably not via a referer string, but via something you can't change like one of Internet Explorer's own bugs/incompatibilities. Like, for example, detecting document.all, or via something proprietary or broken in IE.