A customer had an iPhone that was connected via activesync to a Microsoft Exchange 2007 server. Syncing worked perfectly however when entering an appointment into his iPhone it appeared as an hour earlier in his Outlook calendar.  For example he entered an appointment for 2pm and it appeared as 1pm in his Outlook.

What turned out to be causing this issue was that the phone was set to a time zone that had daylight savings where the exchange server was set to a timezone that didn’t.

In this case the iPhone was set to “Sydney” – which has daylight savings when the exchange server and outlook were set to “Brisbane” which has no daylight savings.

Making sure these two settings are the same solves the issue and the two calendars come back into sync correctly.