Microsoft has announced that it has successfully 
migrated 300 million active Hotmail users to the newer Outlook.com email
 service. The massive move over means there are now 400 million users of
 Outlook.com, according to a blog post announcing the milestone.
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A more polished email experience than Hotmail 
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Naturally, a move of this nature means transfer of huge amounts of data 
as well. The transition meant 150 petabytes of data was migrated over to
 the Outlook servers in six weeks – a feat that’s still boggling our 
minds. For those users who held on dearly to Hotmail, Outlook.com will 
bring a whole new experience. 
 
 Outlook.com leverages many of Microsoft’s other services like SkyDrive 
cloud storage and the People app. Microsoft has added support for SMTP 
send, which means users can send messages from an alias account. With 
two-step authentication also coming soon, Outlook.com users look to be 
in safe hands.