Parallels should be ashamed for spamming their customers with this.
The web version isn’t much better.
Now that I’m on the subject, having owned Parallels Workstation since the beginning and having used VMWare Fusion at work, I can confidently say that VMWare’s is the far better product. It’s much more polished, and most importantly, much more stable than Parallels. I highly recommend that Parallels users give it a try.