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Window Live Hotmail has about 350 million active users and there are 8 billion emails sent every day including mails sent by spammers. In fact, the vast majority of emails headed to Window Live accounts are spam. Out of which only 2.5 billion messages actually reach the inboxes of the users, according to Dick Carddock, Group Program Manager, Windows Live Hotmail. That simple display that Microsoft is sorting on average some 5.5 billion messages, all of which redundant emails that never make it to the 1.3 billion inboxes of the service.

Craddock at Window Live Blog wrote explaining the math –

We know (from measuring after the fact) that about 110 million messages that get delivered are spam. So, that’s a bit less than 5%: 110 million ÷ 2,500 million = 0.044, or less than 5%. We filter out all but 110 million spam messages out of 5.5 billion we receive each day, so that means we’re filtering out 98% of spam: 110 million ÷ 5,500 million = 0.002, or about 2%,”

There are different approaches to measuring spam. Our approach is to use real user data to measure how much spam gets through our system. We select a cross-section of customers who reflect the broad population of Hotmail customers in several dimensions‑such as age of account, country or region‑and invite those customers to participate in our Feedback Loop program. The participation rate in the program is high, with more than 50% of participants classifying messages every day, Craddoc added

It is clear that Hotmail is one of the biggest target of spammers, but Microsoft carry strong spam-fighting technology to keep spammers at bay.

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