It will be done automatically later this summer, or you can do it yourself. Takes about a minute per fund. Log in to vanguard, go into your portfolio view, click on a fund you own thats over $100k. You'll see a "convert to admiral shares" link to the right. Click it. It'll ask you how much of the fund you want to convert...drop down the box and select 'all'. It'll then ask you how you want your gains and dividends handled...drop those two boxes down and select reinvest, pay out to your bank, or transfer to another fund. Follow the rest of the instructions and you're done.
