Windows Live Hotmail serve 4 Billion emails per-day

“4 billion emails are handled by Windows Live Hotmail on average every day, out of the total number of messages that make through Hotmail service, only 3 billion are genuine, and 1 billion spam messages, revealed Arthur de Haan, director, Windows Live Test and System Engineering”. Hotmail is a gigantic service in all dimensions. Here’e […]

“4 billion emails are handled by Windows Live Hotmail on average every day, out of the total number of messages that make through Hotmail service, only 3 billion are genuine, and 1 billion spam messages, revealed Arthur de Haan, director, Windows Live Test and System Engineering”. Hotmail is a gigantic service in all dimensions.

Here’e some of the highlights:

We’re a worldwide service, delivering localized versions of Hotmail to 59 regional markets, in 36 languages.
We host well over 1.3 billion inboxes (some users have multiple inboxes)
Over 350 million people are actively using Hotmail on a monthly basis (source: comScore, August 2009).
We handle over 3 billion messages a day and filter out over 1 billion spam messages - mail that you never see in your inbox.
We’re growing storage at over 2 petabytes a month (a petabyte is ~1 million gigabytes or ~1000 terabytes).
We currently have over 155 petabytes of storage deployed (70% of storage is taken up with attachments, typically photos).
We’re the largest SQL Server 2008 deployment in the world (we monitor and manage many thousands of SQL servers).