Outlook.com, which launched in preview last July, is now up to 400 million active users, the company said Monday.
That figure includes the hundreds of millions of Hotmail users that Microsoft has been migrating over to Outlook.com. That migration is now complete, Microsoft said.
Outlook.com is meant to be the replacement for Hotmail as Microsoft’s free, Web-based personal email service. Outlook.com came out of preview and formally launched in February with 60 million active users.
In a blog post outlining the milestone, Dick Craddock, group program manager for Outlook.com, said that 125 million of the Outlook.com users are accessing it on a mobile device. The company is also adding two new features: SMTP send to make it easier to send mail from different email addresses and deeper integration with SkyDrive.