FYI: How Daylight Savings Time Date Changes affect Scheduling in Outlook Client

The Exchange Team's Blog has a great post on how certain time zones with variable daylight time shifting affect Outlook...

...Time zones are an important thing to keep in mind when working with appointments. We get cases sometimes related to preceived bugs in CDO 1.21 or Outlook Object Model were appointments appear to be off their scheduled times. This is more often than not related to one of the time zones mentioned in this post...