[LINK] Spam after upgrading Norton

[Stephen Wilson]

Dear Linkers

Anyone able to shed light on this?  I upgraded my Norton security suite 
yesterday and in less than 24 hours since I have received six spams with 
subject line prefix [Norton AntiSpam].  I've never received this subject 
line till now, so it can't be mere coincidence. It's spear phishing: 
exactly the sort of e-mail one might expect soon after upgrading. But 
crude and readily spotted: the senders are mostly Viagra related!

How do spammers know when people have upgraded their Norton software?  
Do I have spyware in my PC that has spotted this event and alerted the 
spammers?

Cheers,

Steve Wilson.