Pop up for Free Upgrade to Mavericks
Hi. This is my first post so excuse me if I'm breaking any rules or ettiquette. I was working when I got an unprompted pop up from an application I've never seen before called Noticeboard that says "Upgrade to Mavericks Upgrade your Mac to the latest version of OS X for free." with the options "Now Now" and "Details". Since it happened rather suddenly and I don't recognize the application I just wanted to be sure that this isn't some kind of scam. I haven't touched the window other than to move it out of the way so I could type up this message. Thanks in advance for any help!
MacBook Pro (15-inch Early 2011), Mac OS X (10.7.5)