I used my father-in-law’s laptop recently. I had installed Firefox on it for him when he bought it, and I was happy to see it was still the default browser. I thought it was a little odd that it opened new windows by default instead of new tabs, and then I had a terrible suspicion and checked “Help -> About Firefox” and discovered to some dismay that he was still running Firefox 1.0.7.
Needless to say I installed an up-to-date version immediately. I wonder how many other people might have no clue that their applications are incredibly out of date. I also wonder why his security software (virus scanner/firewall) wouldn’t warn him about such an important aspect of system security.