Updates are very important to all computer users because they address security issues that can be exploited by malware.
This includes windows updates and software updates.
Malware will attack anything that is not up to date.
Malware is very active on the internet.
Don't think for a minute that a mac can't be infected.

Exploit kits that the malware authors use have the ability to know what country you live in, what OS you are using(mac, windows, other), what browser you are using and can determine what software is exploitable, all in a matter of a few seconds