People have been receiving emails entitled something similar to:
“ADOBE PDF READER SOFTWARE UPGRADE NOTIFICATION”
These emails are NOT from Adobe. Refer to the entry on the Adobe blog here: http://blogs.adobe.com/psirt/2010/09/alert-adobe-reader-upgrade-email-spamphishing-scam.html
Never click links in emails to update your application. Go to the vendor’s website by typing their address directly into your browser and follow the links to get your upgrades.