Er, ONE state in Australia is "experimenting" with daylight saving. Western Australia is starting one of its many flirtations with daylight saving time this year.
Victoria, New South Wales, Tasmania, and South Australia are regular users of daylight savings time (although Tasmania starts earlier and ends later). Queensland is worried that daylight savings time will fade the curtains (that extra hour of daylight every day) and confuse the cows, so it never goes onto daylight savings time; the Northern Territory doesn't either. Nett result is that Australia has three time zones in winter, and five time zones in summer.
The Exchange Server is system software - not too surprising it needs patches (seems to need patches very regularly...). :-)