I own a licensed version of Parallels for Linux (version 2.2 I think). Recently, I received an email from Parallels asking me if I wanted to purchase an upgrade to Parallels 3.0 for Mac. Well, since I had recently purchased a Macbook, I took advantage of this and purchased the upgrade and received the activation key in an email. So, I downloaded Parallels 3.0 to my Macbook, installed it, and entered my upgrade activation key. Next, it asked me to enter my original activation key, so I entered the original activation key from my Parallels for Linux version. But it will not accept it. It says that it is an invalid key. If Parallels will not let me upgrade a Linux version to a Mac version, then why did the company send me an email asking me if I wanted to purchase the upgrade?