Moving millions of Hotmail users over to Outlook.com was a gargantuan task that involved migrating 150 petabytes of emails.
Last summer, Microsoft signaled that Hotmail's days were numbered when it previewed Outlook.com
On July 31, 2012, the software maker unveiled a webmail service that adhered to the streamlined look and feel that has come to define the company's software and cloud-based services suite, including Windows 8 and Office 365. Sporting an uncluttered interface and social media integration
, Outlook.com was positioned as an upgraded, next-generation version of Hotmail.
The transition is complete, according to Microsoft. Outlook.com Group Program Manager Dick Craddock announced the milestone in a May 2 company blog post.
"Today, we're excited to announce that we've completed upgrading all Hotmail customers to Outlook.com," Craddock wrote.
Folding Hotmail into Outlook.com swelled the newer service's user base, Craddock said. "Coupled with the growing organic excitement for Outlook.com, this has pushed us to over 400 million active Outlook.com accounts, including 125 million that are accessing email, calendar and contacts on a mobile device using Exchange ActiveSync," he stated.
Moving data from the long-lived webmail service was a massive technical undertaking as well.
The "upgrade" entailed migrating 150 petabytes of email, a process that took six weeks, Craddock said. Downtime was not welcome. "Of course, this had to be done with a live site experience that was handling billions of transactions a day," he wrote.
With the Hotmail era behind it, Microsoft is looking forward. "With the upgrade complete, we've turned our energy and attention to future innovation and to making Outlook.com even better based on your feedback," stated Craddock.
One example of that future innovation is SMTP Send. The feature, which is available now, allows users to send emails from other accounts. Instead of appending "on behalf of" onto emails sent through another account—Gmail, for instance—via Outlook.com, recipients now only see the other account's address.
The capability can enhance privacy and anonymity, according to Craddock. "We knew this was a pain point for some people, and could be a real problem if you had a hidden alias, e.g., when Bruce Wayne wanted to send email as Batman. So now we've made it so that email sent from a different account goes through that account's SMTP server," he wrote.
Microsoft is also in the process of integrating Outlook.com and SkyDrive. Users will soon be able to insert pictures and attachments directly from their SkyDrive accounts with a single sign-on. SkyDrive integration should be available to all users worldwide within weeks, said the company.
The new features follow soon after Microsoft announced that it was enabling Skype calls directly from Outlook.com's
Web-based interface. On April 29, the company launched a preview of a feature that allows the webmail service's users to place video and voice calls directly from their browsers. Microsoft is currently deploying the functionality to select users in the U.K. and the U.S.