Thank you very much for the various comments.
I shall not click the link but in view of the questions raised above it may be of interest if I say that the email was not specifically addressed to me but starts by saying " Because you have Norton Internet Security you can take advantage of over 300 improvements. FREE. As you are an active customer, you're entitled to a free update to Norton Internet Security 2009 ........."
The from line at the very top of the email says " Norton from Symantec[
[email protected]] "
At the bottom of the email it says " Symantec Limited, Dublin 15, Ireland " and adds that " This email is sent by Symantec Store powered by Digital River, Luxembourg "
The word Update becomes underlined if the mouse pointer is held over it. I take this to be the link --- and as said above I will not be trying it !
Thank you for your helpful comments. I hope others will be put on alert by hearing about this.