Hello my name is Chris, a certified computer professional with over 10 years experience. I will be happy to help you.
The email you received is an attempt at what is called "phishing".
Phishing emails are made to look like they are from a legitimate source and they try and fool you into giving over your information such as your password or other personal information.
Toshiba blocking the website is a great thing and possibly saved you from getting your account hacked.
Your email address does not need to be upgraded and you are not going to lose your email address tomorrow. This is a common scam and is meant to scare you into clicking over to another website and typing your user name and password and sometimes they will try and get you to enter your credit card information.
You can go ahead and delete the email as there was no harm done at this time.
Here is a good article on some examples of phishing scams:http://netforbeginners.about.com/od/scamsandidentitytheft/ig/Phishing-Scams-and-Email-Cons/
Everyone who uses email receives these sometimes and it is best to just delete them or ask a professional if you are not sure. You did the right thing in this case so you should be proud of yourself.
If you have further questions please let me know.
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