This feels like a bit of a stretch to us, but Windows Phone Secrets believes it caught a glimpse of Microsoft’s upcoming “Mango” update for Windows Phone 7. During a YouTube user’s NoDo update walkthrough video, right around the 2:48 mark, the cameraman pans his shooter to a second Windows Phone 7 smartphone for just a few seconds. Oddly enough, that smartphone has a feature we’ve never seen before in current builds of Microsoft’s mobile operating system. Inside the main menu, there’s a search button clearly visible. Is this Mango? We’re not sure, but we do know that it’s an option that’s not currently available in the latest NoDo update. That hints that Microsoft either has another minor update up its sleeves, or that this is a feature due out in the bigger Mango update. Microsoft is expected to launch Mango later this year, and it should deliver Internet Explorer 9 along with the Trident 5 rendering engine, HTML 5 and Silverlight, and gesture support to Windows Phone users. A release date is not yet known. Hit the link for the video.