Google  data center outage - ;-) 
   Thursday, April 01, 2010 6:49 AM 
  Posted by Sam Schillace, Gmail Engineering   Director
If you logged into Gmail over the last hour (or   visited the Gmail homepage), you probably noticed that something looked  a  bit off: all the vowels are missing. We realize this makes things   difficult for all of you who rely on Gmail — whether at home or at work —   and we’re incredibly sorry. We take morphological issues like this   extremely seriously, so we want to let you all know what happened and   what we're doing about it.
At 6:01 am Pacific Time, during   routine maintenance at one of our datacenters, the frontend web servers   in that particular datacenter started failing to render the letter 'a'   for a subset of users. As error rates escalated, the strain spread to   other datacenters. We worked quickly to avoid a cascading failure of the   entire alphabet by implementing a stopgap solution that limited the   damage to the letters 'a,' 'e,' 'i,' 'o,' and 'u.' As a result, we're   experiencing Gmail’s first temporary vowel outage. (We’re still   investigating whether the letter 'y' is impacted and will post an update   here shortly.)
Over the last hour we've received numerous   reports of this issue via our help forums, from colleagues at Google,   and via email you’ve sent us. Some of you have already found creative   workarounds for communicating without vowels, like Aaron, who sent us   this:

Having   80.8% of the alphabet available is significantly below the 99.9% full   letter uptime reliability we strive for. Since identifying the root  case  of this issue, we’ve started bringing vowels back to Gmail, so you   should see them back in your account within the next few hours if you   don’t already. In the meantime, while you may still see this issue in   Gmail's web interface, both IMAP and POP access are functioning   normally. We'll post an update as soon as things are fully resolved and,   again, we're v3ry s0rry.
Update   (7:30 am): We’ve determined that the letter 'y' is not  impacted.