Yahoo IPv6 Upgrade Could Shut Out 1M Users
alphadogg writes "Yahoo is forging ahead with a move to IPv6 on its main Web site by year-end despite worries that up to 1 million Internet users may be unable to access it initially. Yahoo's massive engineering effort to support IPv6 — the long-anticipated upgrade to the Internet's main communications protocol — could at first shut out potential www.yahoo.com users due to what the company and others call 'IPv6 brokenness.'"
Yahoo mail has a nice tab-based interface so you can open multiple emails while writing a few more, which Gmail is missing. It's also hard to migrate 10 years' of emails to a new service (they make it hard, at least) - not to mention getting everyone to use your new email address.
They had their servers respond to both IPv4 and IPv6 on the same domain name for a day. Among one million visitors they only had 5 with a problem. 2 could be solved by rebooting the router and or the computer, 2 had unreleated problems with their internet, and one actually had triggered a bug in the OS.
http://www.heise.de/netze/meldung/IPv6-Tag-bei-heise-de-Erste-Ergebnisse-1081201.html