The team behind Outlook.com revealed in a tweet that one million people signed up for the new email service in just six hours. Microsoft unveiled its Hotmail replacement Tuesday at noon Eastern, and by dinnertime it had cracked seven digits. One of the first web-based email services, Hotmail has been around since 1996 and was acquired by Microsoft in 1997. In rebranding it as Outlook, Microsoft has integrated social networks and replaced the formerly cluttered interface with a clean layout that’s in line with the design aesthetic of Windows 8.

For the full run-down on the new Outlook, check out Mashable‘s review. And if you want to make sure you get the Outlook.com email address you want, we’ve got step-by-step instructions.