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You send an appointment from one Microsoft Exchange Server organization to another Exchange organization by using Microsoft Exchange Server 2007. If one of the organizations is in the Western Australia time zone, the appointment may be incorrect by one hour.
This problem occurs because the Exchange 2007 Collaboration Data Objects (CDO) tables do not contain updated DST transition times for the Western Australia time zone if Update Rollup for Microsoft Exchange Server 2007 is not installed.
Note Daylight saving time (DST) was introduced to Western Australia for a three-year trial period that started December 3, 2006.
To resolve this problem, install Update Rollup 4 for Exchange Server 2007 on the server that is running Exchange Server 2007. For more information about Update Rollup 4 for Exchange Server 2007, see the following Exchange Help topic: