Microsoft started previewing its new Outlook.com interface back in May, but it's now rolling out broadly today. New users who sign up to the service from the US will immediately access the new interface, and existing users are being migrated each week. Microsoft is migrating its Outlook.com email service over to Office 365, and it now includes a new interface and features.

Microsoft is adding 13 new themes to its email service. While the look is familiar, it's now more closely aligned to the look and feel of the desktop and Windows 10 versions of the Outlook app. It also looks a lot more like the Outlook web versions of Microsoft's Office 365 service.

Most of the new features are centered around improving the overall email experience. Clutter is designed to sort messages you ignore into a separate folder to keep your inbox clean. Microsoft says Clutter will automatically learn which emails to filter out over time, and you can manually drag messages in and out of the Clutter folder to help train it. If email filtering isn't your thing, you can turn Clutter off to keep a classic inbox.

Microsoft is also improving the search interface for Outlook.com. Search suggestions will automatically highlight the people you email regularly when you're searching for content, and a Refiners feature lets you filter search results based on sender, folder, date, and attachments. There's even a highlight in search results so you can clearly find what you're looking for. Search was one of the weak points of Outlook.com, so it's encouraging to see Microsoft address this.

Add-ins are the big new addition

The biggest addition with the new Outlook.com is add-ins. Microsoft is highlighting some add-ins from Giphy, Yelp, Wunderlist, Uber, PayPal, and Evernote today. The Giphy app will let you easily insert GIFs into emails, a perfect addition to celebrate birthdays appropriately.

Skype integration is also being improved with the new Outlook.com, with an improved interface and the ability to schedule calls soon. Microsoft is also including @ mentions for emails, and the ability to quickly insert emoji in messages. Microsoft says it's upgrading "millions of accounts" each week, so the new interface should arrive for everyone in the coming weeks.