Microsoft has been making a big push with its Outlook.com email service since migrating all of its Hotmail users there, and it's now also set to more deeply integrate the service into Windows 8.1. The company has detailed a number of updates to the operating system's Mail app in a blog post today -- something first promised at its BUILD conference this summer -- which will see the app brought in line with a number of features that have so far remained exclusive to the web-based offering. That includes automatic sorting of newsletters and social updates, Outlook's so-called Sweep feature for organizing email, as well as automatic syncing across devices with Exchange ActiveSync. Outside of those Outlook-related features, the app will now also let you finally drag-and-drop messages into folders, and Microsoft says that the entire app has been optimized for use on a tablet. You can find a full rundown of all the new features on Microsoft's Windows Experience Blog.