So I've just registered for the up-to-date code for a free upgrade to ML and received the email for the password/content code. I'm just clarifying with all you wise ol' long-term Apple users as to whether this definitely does not expire as the email claims. I'm hesitant to upgrade my MBA for now as I'm still waiting on my external hard drive to back up all the materials, and probably won't do the ML upgrade until a little while after I receive my external hard drive. So when I do choose to upgrade using the content code in 2 or 3 weeks from now, would I still be entitled to the upgrade free-of-charge? Thanks in advance.