Yesterday Yahoo shut down the legendary internet service GeoCities, which they bought back in 1999 for $3.57 billion in stock. While this does not appear to have anything in common with Yahoo Mail, it seems like the shutdown of GoeCities might have caused an outage for Yahoo Mail.
Andrew Molyneux, Program Manager at Yahoo Mail wrote on YMail Blog that “[a] small fraction of Yahoo! Mail users may have experienced intermittent email issues earlier today, October 26, but the problem has now been resolved.”
While the outage did not last very long, it does appear to have been more widespread than the official reports. Downrightnow, a crowd sourced uptime monitor, reports that the outage lasted for at least a few hours.

Downtime report from Downrightnow
Perhaps the shutdown of GeoCities and this outage was pure coincidence, but it’s likely that the shutdown of GeoCities did involve quite a few changes in Yahoo’s setup. These changes could very well have affected the routing to Yahoo Mail too.
Update: Seems like Yahoo had another outage today according to DownRightNow (10/29/09).

Yahoo Mail Outage has been almost Continuous for 1 1/2 weeks. Who is Yahoo kiddis your computersng?? HELP at Yahoo insinuates that it’
Hi Linda,
1 1/2 week of downtime? Wow that’s very interesting. Have you contacted Yahoo?
my e-mail was removed,please return it
i always get errors come up i do not kow why it has been updated
I have no e-mail. Somehow it has been removed. I have been trying to get it published now for several weeks and I am very upset! Please return it due to the fact that it is not my fault. Thank you very very much in advance Vada M.
Vada,
There’s nothing we can do about that. You’ll have to contact Yahoo for that. We are not affiliated with Yahoo in any way.