<p>Outlook.com, Microsoft's overhauled email service, completed last week the "upgrading" of some 300 million accounts of its Hotmail email service to the new product.</p><p>Program manager Dick Craddock said the task involved migrating some 150 petabytes one petabyte is one million gigabytes of Hotmail user data in just six weeks.</p><p>"When Outlook.com came out of preview in February, it already had more than 60 million active accounts. However, Hotmail was still one of the most widely used services, with over 300 million active accounts. This made the magnitude of the process incredible, maybe even unprecedented. This meant communicating with hundreds of millions of people, upgrading all their mailboxes--equaling more than 150 million gigabytes of data--and making sure that every person's mail, calendar, contacts, folders, and personal preferences were preserved in the upgrade," Craddock said in a blog post.</p><p>He said Microsoft spent the last few weeks ensuring that everything was completed "in line with our high quality expectations."</p><p><a href="http://www.gmanetwork.com/news/story/307049/scitech/technology/outlook-com-completes-hotmail-migration">Keep reading...</a></p><p>Read also:</p><p><a href="http://www.techhive.com/article/2037525/spams-birthday-and-hotmails-closure-lead-email-milestones.html">Spam&#039;s birthday and Hotmail&#039;s closure lead email milestones</a> (TechHive)</p><p><a href="http://www.tgdaily.com/hardware-brief/71495-hotmail-is-history">Hotmail is history</a> (TG Daily)</p><p><a href="http://www.newsday.co.zw/2013/05/06/hotmail-is-dead-as-outlook-com-takes-over/">Hotmail is dead as Outlook.com takes over</a> (NewsDay)</p><p>Explore: <a href="http://news.google.com/news/more?ncl=d9twFZKa2a4w-AM5Ib31TKxIqcDxM&ned=us">23 additional articles.</a></p>