Microsoft this week debuted a new app launcher for its consumer-oriented productivity services—Office Online, Outlook.com and OneDrive—providing a more discoverable and consistent way to switch between these web apps. Visually, the change isn't a huge deal, but I think it looks cleaner than before.
Previously, you could access this app launcher by clicking (or tapping) the small, chevron-type icon you see to the right of the web app's name here (People, part of Outlook.com):
When you did so, the app launcher opened as a sort of pane at the top of the browser window like so:
Now, the app launcher is a bit more obvious. You access it by clicking the more obvious button that looks like a gird of little squares. This is more logically placed in the upper-right corner of the browser window, too.
When you access this, the new app launcher opens. It's more of a floating window and takes up less horizontal space, which will probably help on low-resolution tablets.
Again, not a huge deal. (And that People shot above is what that web app still looks like, so it's not been rolled out universally yet, at least not for me.) But it's a nice change and it's also visually consistent with the changes Microsoft recently made to the web portal for business versions of Office 365.