Microsoft products which are aware of daylight saving time changes need to be updated to include the new Western Australia time zone rules.
The following table shows the start and end dates for the daylight saving period in each year of the trial

Start End
the hour of 2 a.m. on 3 December 2006 the hour of 2 a.m. on 25 March 2007
the hour of 2 a.m. on 28 October 2007 the hour of 2 a.m. on 30 March 2008
the hour of 2 a.m. on 26 October 2008 the hour of 2 a.m. on 29 March 2009

Note: Both the start and end time are specified in standard time, so the end time is 3 am daylight saving time.
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