The Mac Business Unit over at Microsoft is hard at work on Office for Mac 2011, and released some new details about the product, slated to ship in the 2010 holiday season. The biggest change, at least visually, is the inclusion of the ribbon interface, which has been a part of the Windows Office suite since 2007. Microsoft did say that they took great care to make the ribbon on the Mac side of things feel very Mac-like, so that’s a plus, we guess. Another big change/addition here is that Entourage goes away, and gets replaced with Outlook for Mac. You’ll be able to import a PST file and get right to work, and you’ll have Time Machine and Spotlight support as well, which we think is fantastic for those of you who live in Outlook and currently rely on a product like Parallels or Fusion to make that happen.